Impact Compressive Fracture of Synthetic Quartz Accompanied by Electromagnetic Phenomenon

2016 ◽  
Vol 715 ◽  
pp. 13-20
Author(s):  
Hidetoshi Kobayashi ◽  
Keitaro Horikawa ◽  
Kenichi Tanigaki ◽  
Kinya Ogawa
Keyword(s):  
Mechanical Properties ◽  
Electromagnetic Waves ◽  
Dynamic Compression ◽  
Compression Tests ◽  
Ferrite Core ◽  
Static Tests ◽  
Synthetic Quartz ◽  
Loading Direction ◽  
Electromagnetic Phenomenon ◽  
The Relationship

In order to clarify the relationship between the mechanical properties of synthetic quartz and the electromagnetic phenomena during its fracture, a series of uniaxial compression tests were carried out at quasi-static and dynamic rates. Not only the stress-strain curves but also the output of ferrite-core antenna located close to the specimens were measured in a shield box made of permalloy plates. Since the synthetic quartz has three characteristic axes, i.e. optical axis, electric axis and machine axis, the effect of loading direction on the mechanical properties and electromagnetic phenomena of quarts was also examined. The dynamic compressive strength was greater than those in static tests and there is strain-rate dependence in their strength of synthetic quartz. It was also found that there are not any remarkable differences due to the loading direction with respect to the intensity of electromagnetic waves measured in the dynamic compression tests, i.e. the electromagnetic phenomenon does not depend on the loading direction.

scholarly journals Influence of artificial aging: mechanical and physicochemical properties of dental composites under static and dynamic compression

2021 ◽  
Author(s):  
D. C. Gornig ◽  
R. Maletz ◽  
P. Ottl ◽  
M. Warkentin
Keyword(s):  
Mechanical Properties ◽  
Water Sorption ◽  
Artificial Aging ◽  
Filler Content ◽  
Dynamic Compression ◽  
The Other ◽  
Chemical Degradation ◽  
Dental Composites ◽  
Compression Tests ◽  
Acid Ph

Abstract Objective The aim of the study was to evaluate the influence of filler content, degradation media and time on the mechanical properties of different dental composites after in vitro aging. Materials and Methods Specimens (1 mm3) of three commercially available composites (GrandioSO®, Arabesk Top®, Arabesk Flow®) with respect to their filler content were stored in artificial aging media: artificial saliva, ethanol (60%), lactic acid (pH 5) and citric acid (pH 5). Parameters (Vickers microhardness, compressive strength, elastic modulus, water sorption and solubility) were determined in their initial state (control group, n = 3 for microhardness, n = 5 for the other parameters) and after 14, 30, 90 and 180 days (n = 3 for microhardness, n = 5 for the other parameters for each composite group, time point and media). Specimens were also characterized with dynamic-mechanical-thermal analysis (compression tests, F =  ± 7 N; f = 0.5 Hz, 1 Hz and 3.3 Hz; t = 0–170 °C). Results Incorporation of fillers with more than 80 w% leads to significantly better mechanical properties under static and dynamic compression tests and a better water sorption behavior, even after chemical degradation. The influence of degradation media and time is of subordinate importance for chemical degradation. Conclusion Although the investigated composites have a similar matrix, they showed different degradation behavior. Since dentine and enamel occur only in small layer thickness, a test specimen geometry with very small dimensions is recommended for direct comparison. Moreover, the use of compression tests to determine the mechanical parameters for the development of structure-compatible and functionally adapted composites makes sense as an additional standard. Clinical relevance Preferential use of highly filled composites for occlusal fillings is recommended.

Mechanical Properties of Bulk Nanocrystalline Silver-Using Compression Tests

2010 ◽  
Vol 152-153 ◽  
pp. 1313-1316
Author(s):  
Guo Jun Hu ◽  
Zhi Quan Hong
Keyword(s):  
Mechanical Properties ◽  
Coarse Grained ◽  
Strain Rates ◽  
Test Results ◽  
Compression Tests ◽  
Static Test ◽  
Rate Dependent ◽  
Average Grain Size ◽  
Bulk Nanocrystalline ◽  
The Relationship

In this paper, the compression test on the bulk nanocrystalline sliver ( n Ag) with average grain size of 50 nm was made. The stress-strain curves under different strain rates were obtained by test. The test results show that the mechanical behavior of n Ag is rate-dependent, and the dynamic compress yield stress are about 1.5 times of that n Ag in static test condition; The effect of strain harding on n Ag is smaller than that of coarse-grained silver (c Ag) in plastic deformation; The relationship between the yield strength and the logarithm of strain rate is approximately linear.

scholarly journals Mechanical properties of high-density TRIP steel honeycomb structures with varying cell profiles under different loading conditions

2018 ◽  
Vol 183 ◽  
pp. 03014 ◽  
Author(s):  
Christine Baumgart ◽  
Christian Weigelt ◽  
Christos G. Aneziris ◽  
Lutz Krüger
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Dynamic Compression ◽  
Wall Material ◽  
Cell Geometry ◽  
Channel Axis ◽  
Honeycomb Structures ◽  
Loading Direction ◽  
Out Of Plane ◽  
Plane Direction

As the mechanical properties of honeycomb structures are influenced by several parameters, detailed analysis is necessary before their potential application in transportation industry components. Previous Finite Element Model (FEM)-based numerical analysis demonstrated that variation in cell geometry affects the achievable strength level and, thus, the energy absorption capability. According to this FEM study, the Kagome geometry – an ordered sequence of hexagons and triangles – exhibits properties that are particularly promising when compared to the square-celled structures investigated to date. When the load is applied parallel to the channel axis (the out-of-plane direction), the increment of strength is comparatively low, whereas in the in-plane direction (loading orthogonal to the channel axis), the dissipated specific energy can reach almost double that of the square-celled structure. In this study, the results of static and dynamic compression tests – performed in the out-of-plane and in-plane modes – are presented to examine the influence of strain rate and loading direction on the characteristic deformation stages of squarecelled and Kagome structures. Particular attention is paid to deformation induced martensite formation in the cell wall material, indicating the TRansformation Induced Plasticity (TRIP) effect as a function of applied cell geometry, strain rate and loading direction.

scholarly journals Mechanical Properties of PolyJet 3D-Printed Composites Inspired by Space-Filling Peano Curves

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3516
Author(s):  
Changlang Wu ◽  
Truong Tho Do ◽  
Phuong Tran
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Volume Fraction ◽  
General Rule ◽  
Second Order ◽  
Compression Tests ◽  
Space Filling ◽  
First Order ◽  
Loading Direction ◽  
3D Printed

This paper proposes a design of novel composite materials inspired by the Peano curve and manufactured using PolyJet 3D printing technology with Agilus30 (flexible phase) and VeroMagentaV (rigid phase) materials. Mechanical properties were evaluated through tensile and compression tests. The general rule of mixture (ROM) for composites was employed to approximate the tensile properties of the hybrid materials and compare them to the experimental results. The effect of reinforcement alignments and different hierarchies are discussed. The results indicated that the 5% inclusion of the Peano reinforcement in tensile samples contributed to the improvement in the elastic modulus by up to 6 MPa, but provided no obvious enhancement in ultimate tensile strength. Additionally, compressive strengths between 2 MPa and 6 MPa were observed for compression cubes with first-order reinforcement, while lower values around 2 MPa were found for samples with second-order reinforcement. That is to say, the first-order reinforcement has been demonstrated more effectively than the second-order reinforcement, given the same reinforcement volume fraction of 10% in compression cubes. Different second-order designs exhibited slightly different mechanical properties based on the ratio of reinforcement parallel to the loading direction.

Compression Tests of High Strength Steels

2008 ◽  
Vol 59 ◽  
pp. 293-298
Author(s):  
Vaclav Mentl ◽  
Josef Bystricky
Keyword(s):  
Mechanical Properties ◽  
Mechanical Testing ◽  
High Speed ◽  
Dynamic Compression ◽  
Testing Machine ◽  
High Strength Steels ◽  
High Strength ◽  
Strain Rates ◽  
Compression Tests ◽  
Impact Compression

Mathematical modelling and virtual testing of components and structures represent a useful and economic tool for design and safety assessment. The basic mechanical properties which can be found in material standards are not relevant in cases where the real service conditions differ from those applied during standardised testing. Thus e.g. mechanical behaviour at higher strain rates can be interesting for the car components when the simulation of crash situations is used during structure development. The dynamic compression tests are usually performed by means of drop towers, by means of high speed hydraulic testing machines or Hopkinson bar method. At the Mechanical Testing Laboratory of the SKODA Research Inst. in Pilsen, Czech Republic, an instrumentation of Charpy pendulum testing machine was realised in order that it was possible to perfom dynamic compression tests, [1], and the compatibility of obtained results in comparison with traditional impact compression tests was verified within the round–robin carried out by TC5 ESIS Sub-Committee on “Mechanical Testing at Intermediate Strain Rates“, [2]. A new striking tup and load measurement system were designed and callibrated. At the same time, a new software was developed which makes it possible to evaluate the test force-deformation record. The goal of this study was 1. to check the possibility of compression testing of high strength materilas by mens of Charpy pendulum, and 2. to study the strain rate influence on basic mechanical properties.

scholarly journals A Research Procedure for Examining the Dynamic Properties of Multi-Wire Springs used in NR-30 Guns

2019 ◽  
Vol 10 (3) ◽  
pp. 61-78
Author(s):  
Patryk MODRZEJEWSKI ◽  
Zdzisław IDZIASZEK
Keyword(s):  
Dynamic Properties ◽  
Dynamic Compression ◽  
Compression Tests ◽  
Limit Values ◽  
Static Tests ◽  
Static Test ◽  
Research Results ◽  
Spring Force ◽  
Research Procedure ◽  
The Impact

The article presents a concept of the procedure for researching the dynamic properties of the multi-wire springs used in NR-30 guns. The aim of the research was to check the possibilities of determining the limit values of the flexibility of the multi-wire springs for the NR-30 gun, as well as to verify the obtained research results using those from range and static tests (after long compression). While verifying the method (selected measurements of 4 springs with varying degrees of wear), static and dynamic compression tests were performed on a spring mounted on a gun on specially prepared testing stations. The description of the data measurement and acquisition method applied should be considered an important element of the description of a testing station. Based on the obtained research results, it has been inferred that, during the striker’s backward movement, wave phenomena likely transpire in the spring. Force value fluctuations taking place during the spring’s movement are visible in the obtained diagrams. The dynamic and static test results (on springs with varying degrees of wear) allowed the authors to evaluate the impact of a multi-wire spring’s wear on the value of its force of interaction with the automation elements of an NR-30. Based on the data obtained, the assumptions for the method of evaluating multi-wire springs’ durability and using it to evaluate the suitability of a given spring type for use according to its technical state, have been elaborated. The final determination of the limit values of the springs’ parameters requires further research using a station with an ammunition belt encumbrance emulator, as well as emulation of the overloads of the kinematic arrangement of the gun while airborne.

The Formation of Fine-Grained Structure in S304H-Type Austenitic Stainless Steel during Hot-To-Warm Working

2012 ◽  
Vol 715-716 ◽  
pp. 380-385 ◽  
Author(s):  
Marina Tikhonova ◽  
Valeriy Dudko ◽  
Andrey Belyakov ◽  
Rustam Kaibyshev
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Compression Tests ◽  
Scale Level ◽  
Single Pass ◽  
Fine Grained ◽  
Loading Direction ◽  
Fine Grained Structure ◽  
Multiple Compression ◽  
The Relationship

The dynamic process of grain evolution in a Super304H austenitic stainless steel was studied in compression tests. The tests were carried out to a strain of 0.7 at temperatures ranging from 700 to 1000°C and strain rate of 10-3s-1. In addition to single pass compression the multiple compressions with changing the loading direction in 90o and decreasing the temperature with step of 100°C from 1000 to 700°C in each pass were utilized to achieve large cumulative strains. Under multiple compression the values of flow stresses were lower than those at single-pass compressions under the same temperatures. The fraction of dynamically recrystallized grains decreased from 1.0 to almost zero with decreasing temperature in single-pass compressions. On the other hand, almost fully recrystallized structure developed under conditions of multiple compressions. The size of dynamically recrystallized grains decreased with decreasing the deformation temperature, approaching a submicrometer scale level at 700°C. The relationship between the deformation conditions and operating mechanisms of dynamic recrystallization is discussed in some details.

scholarly journals Investigation on compressive behavior of Cu-35Ni-15Al alloy at high temperatures

2014 ◽  
Vol 32 (3) ◽  
pp. 341-349 ◽  
Author(s):  
Cong Li ◽  
Jian Chen ◽  
Wei Li ◽  
Yongle Hu ◽  
Yanjie Ren ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Deformation Temperature ◽  
Loading Rate ◽  
Cast Alloy ◽  
Compression Tests ◽  
Rich Phase ◽  
Increasing Trend ◽  
Alloy Increase ◽  
The Relationship

AbstractMicrostructures and mechanical properties of Cu-35Ni-15Al alloy in cast and porous states were studied by scanning electron microscopy and compression tests. The influence of porosity, deformation temperature and loading rate on mechanical properties of the two kinds of alloys was investigated. The results show that the as cast alloy and porous alloys have almost the same phase constitution: Cu rich phase, Ni rich phase and K intermetallics. The yield strength of porous alloys increases continuously with decreasing porosity, the relationship between porosity and yield stress follows Gibson-Ashby equation. With decreasing deformation temperature, the yield strength of as cast alloy and porous alloy increase. With the increase of loading rate, the yield strength of these alloys shows an increasing trend. After compression, the microstructure of as cast alloy is more uniform, and porous alloys are more prone to have localized deformations.

Static Compression Tests of Concentrated Crystallized Carbon Dioxide

2015 ◽  
Vol 816 ◽  
pp. 490-495 ◽  
Author(s):  
Jan Górecki ◽  
Ireneusz Malujda ◽  
Krzysztof Talaśka ◽  
Mateusz Kukla ◽  
Paweł Tarkowski
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Test Methods ◽  
Test Results ◽  
Compression Tests ◽  
Static Compression ◽  
Starting Point ◽  
Ratio Limit ◽  
Limit Stress ◽  
The Relationship

This paper presents the results of static compression tests of concentrated crystallized carbon dioxide. The test results obtained under this research describe the relationship between the compressive stress and strain allowing to estimate the proportionality ratio, limit stress and critical stress values. Special test methods were used due to low temperature of crystallized carbon dioxide (minus 78.5°C) and its sublimation under standard testing conditions. The results of the mechanical properties of agglomerated CO2 were compared with the mechanical properties of other known materials. This allowed us to derive assumptions, which can become the starting point of the process to build a mathematical model describing the dry ice compaction and granulation processes.

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