Compressive Behavior at Ambient Temperature of ZK60-xDy Magnesium Alloys

2016 ◽  
Vol 849 ◽  
pp. 128-133
Author(s):  
Zheng Hua Huang ◽  
Wen Jun Qi ◽  
Jing Xu
Keyword(s):  
Ambient Temperature ◽  
Shear Fracture ◽  
Pure Shear ◽  
Extrusion Direction ◽  
Axial Direction ◽  
Compressive Property ◽  
Compressive Behavior ◽  
Specimen Dimension ◽  
Zk60 Alloy ◽  
Specimen Orientation

Effects of the compressive rate, specimen dimension, specimen orientation and microstructure on the compressive property at ambient temperature of extruded ZK60-xDy alloy rods were investigated. The results show that the specimen dimension, specimen orientation and microstructure except the compressive rate play a significant role on the compressive property. The compressive strength σbc increased significantly by the improving amplitude of 65~110 MPa with increasing the height/diameter ratio h/φ of the cylindrical compressive specimen from 0.5 to 1, however it was not enhanced further as h/φ increased to 2. With increasing the value of h/φ, the yield stage on the compressive curve was strengthened gradually, and meanwhile the compressive macro-fracture changed from the inverted "V" type to pure shear fracture with an angle of 45°. Compared with the specimen whose axial direction was parallel to the transverse direction, σbc was enhanced by the improving amplitude of 60~120 MPa for the specimen whose axial direction was parallel to the extrusion direction. When small amount of Dy (0.31%) was added into ZK60 alloy, σbc was increased from 500 MPa to 540 MPa. However, it slightly decreased to 515 MPa again when the Dy content increased to 4.32%.

Microstructure and Mechanical Property of Mg-Sn-Al Wrought Magnesium Alloys

2017 ◽  
Vol 898 ◽  
pp. 97-103 ◽  
Author(s):  
Zheng Hua Huang ◽  
Nan Zhou ◽  
Jing Xu ◽  
Yang De Li ◽  
Wei Rong Li
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Tensile Strength ◽  
Yield Strength ◽  
Ambient Temperature ◽  
Hot Extrusion ◽  
Average Grain Size ◽  
Zk60 Alloy ◽  
Cast Alloys ◽  
Az31b Alloy

The microstructures, phase constitutions and mechanical properties of as-cast samples, extruded rods and plates of Mg-3.52Sn-3.32Al and Mg-6.54Sn-4.78Al alloys were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction and mechanical testing. The results show that as-cast microstructure consists of α-Mg matrix, Mg2Sn and a few dispersed β-Mg17Al12 phases. The two as-cast alloys exhibit good tensile mechanical properties. After hot extrusion, dynamic recrystallization occurs. Average grain size reaches 6 μm ~ 8 μm for rods, and a lot of fine micro-scaled particles exist, resulting in significant enhancement of tensile mechanical properties. The extruded Mg-3.52Sn-3.32Al rod exhibits better comprehensive tensile mechanical property than AZ31B alloy, with tensile strength σb of 295 MPa, yield strength of 200 MPa and elongation of 21.5% at ambient temperature. The extruded Mg-6.54Sn-4.78Al rod exhibits equivalent comprehensive tensile mechanical properties with ZK60 alloy, achieving tensile strength of 355 MPa, yield strength of 275 MPa and elongation of 11% at ambient temperature. The extruded plates at ambient temperature performed a tensile strength of 270 MPa.

Loading Direction Versus Crack Propagation Path in a Lead-Free Single Solder Joint Sample

2008 ◽  
Author(s):  
Feng Gao ◽  
Jianping Jing ◽  
Janine Johnson ◽  
Frank Z. Liang ◽  
Richard L. Williams ◽  
...  
Keyword(s):  
Solder Alloy ◽  
Mixed Mode ◽  
Shear Fracture ◽  
Pure Shear ◽  
Shear Loading ◽  
Propagation Path ◽  
Mixed Mode Loading ◽  
Cohesive Failure ◽  
Loading Direction ◽  
Shear Component

In this paper, single solder joints (SSJs) were subjected to moderate speed loading (5mm/sec) in different directions, from pure tensile, mixed mode to pure shear. Fracture surfaces from different loading directions were examined both experimentally and numerically. It is observed that intermetallic compound (IMC) is formed between the solder alloy and the Cu pad, and failure typically occurs at or near the solder/IMC/Cu interfaces on the board side. Pure tensile loading typically leads to interfacial fracture along the IMC/Cu interface. Mixed mode loading usually results in a mixture of interfacial and cohesive failure with crack propagating in a zigzag fashion between the solder/IMC interface and the solder alloy. Loading with higher shear component tends to result in more cohesive failure of the solder alloy near the solder/IMC interface. Under pure shear loading, failure is almost always cohesive within the solder alloy near the solder/IMC interface.

Implementation of a Mesoscopic Mechanical Model for the Shear Fracture Process Analysis of Masonry

2005 ◽  
Vol 297-300 ◽  
pp. 1025-1031 ◽  
Author(s):  
Shu Hong Wang ◽  
Chun An Tang ◽  
Juan Xia Zhang ◽  
Wan Cheng Zhu
Keyword(s):  
Mechanical Model ◽  
Damage Mechanics ◽  
Shear Fracture ◽  
Process Analysis ◽  
Pure Shear ◽  
Failure Process ◽  
Shear Loading ◽  
Short Paper ◽  
Masonry Material ◽  
Cracking Process

This short paper will present a two-dimensional (2D) model of masonry material. This mesoscopic mechanical model is suitable to simulate the behavior of masonry. Considering the heterogeneity of masonry material, based on the damage mechanics and elastic-brittle theory, the new developed Material Failure Process Analysis (MFPA2D) system was brought out to simulate the cracking process of masonry, which was considered as a three-phase composite of the block phase, the mortar phase and the block-mortar interfaces. The crack propagation processes simulated with this model shows good agreement with those of experimental observations. It has been found that the shear fracture of masonry observed at the macroscopic level is predominantly caused by tensile damage at the mesoscopic level. Some brittle materials are so weak in tension relative to shear that tensile rather than shear fractures are generated in pure shear loading.

Influence of Structure Parameters on Compressive Behavior of Aluminum Foam

2011 ◽  
Vol 80-81 ◽  
pp. 123-127
Author(s):  
Fang Wang ◽  
Lu Cai Wang ◽  
Zhi Min Zhang
Keyword(s):  
Energy Absorption ◽  
Size Effects ◽  
Deformation Behavior ◽  
Aluminum Foam ◽  
Functional Materials ◽  
Compressive Property ◽  
Absorption Property ◽  
Compressive Behavior ◽  
Orthogonal Experiments ◽  
Static And Dynamic Loading

Foamed aluminum has been recently developed as one of new structure functional materials due mainly to its excellent properties such as energy absorption property. It is significant to investigate the compressive behavior and energy absorption property of foamed aluminum under the condition of static and dynamic loading. The compressive deformation behavior of foamed aluminum with open pore structure was experimentally studied and the effects of the porosity, the type of materials, the pore size and the sample size were discussed in detail by means of the orthogonal experiments. The results showed that the type of materials had the most evident influence on the compressive property of foamed aluminum among the factors investigated, and that the size effects of the experimental results were observed.

scholarly journals Microalgal biomass as renewable biofiller in natural rubber compounds

2021 ◽  
Author(s):  
Emanuela Bellinetto ◽  
Riccardo Ciapponi ◽  
Marco Contino ◽  
Claudia Marano ◽  
Stefano Turri
Keyword(s):  
Thermal Analysis ◽  
Carbon Black ◽  
Natural Rubber ◽  
Shear Fracture ◽  
Pure Shear ◽  
Rubber Matrix ◽  
Compression Moulding ◽  
Microalgal Biomass ◽  
Dynamic Mechanical ◽  
Rubber Compounds

AbstractMicroalgal biomasses, consisting of micronized Spirulina Platensis and its low protein fraction, were investigated in this work as possible renewable biofillers in natural rubber compounds, with the aim of replacing the commonly used carbon black. Natural rubber, in some cases blended with 10% of epoxidized natural rubber to improve the matrix-filler affinity, was compounded with 25, 35, 50 and 75 phr of each biomass. Compounds with 25, 35 and 50 phr of carbon black N990 were also prepared as benchmarks. After compounding, vulcanization times were determined by dynamic mechanical analysis. Rubbers were vulcanized by compression moulding and characterized by means of morphological analysis (scanning electron microscopy), thermal analysis (thermogravimetric analysis, dynamic mechanical thermal analysis) and mechanical tests (tensile tests, strain induced crystallization detection by X-ray diffraction, pure shear fracture tests). Microalgal biomass turned out to be homogeneously dispersed in natural rubber matrix and the materials obtained required lower curing times compared to carbon black compounds. It was found that, up to 50 phr, Spirulina has the ability to increase rubber tensile strength and modulus, acting similarly to N990, while decreasing rubber thermal stability and fracture toughness.

Effect of Load Direction on Tensile Yield Properties in Mg-3Al-Zn Alloy

2011 ◽  
Vol 682 ◽  
pp. 145-151 ◽  
Author(s):  
Ran Liu ◽  
De Liang Yin ◽  
Jing Tao Wang
Keyword(s):  
Yield Strength ◽  
Extrusion Direction ◽  
Tensile Load ◽  
Longitudinal Direction ◽  
Az31 Alloy ◽  
Tensile Yield Strength ◽  
Rolled Sheet ◽  
Orientation Factor ◽  
Tension And Compression ◽  
Specimen Orientation

Deformation anisotropy of samples from rolled sheet and extruded rod of AZ31 alloy was investigated in the present work. A strong basal plane texture is detected formed during rolling and extrusion, and both rolled and extruded samples exhibit similar mechanical behavior: tensile yield strength is the highest in the specimens parallel to the longitudinal direction, and decrease continuously as the specimen orientation departs from the longitudinal direction. Using texture analysis and optical microscopy it has been found that, the obvious anisotropy can be explained by texture and orientation factor during tension and compression. Basal slip and twinning are restricted when tensile load is applied in the rolling and extrusion direction, which results in high tensile yield strength along the two directions.

Fracture Characterisation by Butterfly-Tests and Damage Modelling of Advanced High Strength Steels

2021 ◽  
Vol 883 ◽  
pp. 294-302
Author(s):  
Bernd Arno Behrens ◽  
Kai Brunotte ◽  
Hendrik Wester ◽  
Matthäus Dykiert
Keyword(s):  
Stress State ◽  
Shear Fracture ◽  
Pure Shear ◽  
Testing Machine ◽  
High Strength Steels ◽  
High Strength ◽  
Fracture Initiation ◽  
Forming Limit ◽  
Advanced High Strength Steels ◽  
Damage Models

Advanced High Strength Steels (AHSS) are widely used in today's automotive structures for lightweight design purposes. FE simulation is commonly used for the design of forming processes in automotive industry. Therefore, besides the description of the plastic flow behaviour, also the definition of forming limits in order to efficiently exploit the forming potential of a material is required. AHSS are prone for crack appearances without prior indication by thinning, like exemplary shear fracture on tight radii and edge-fracture, which can not be predicted by conventional Forming Limit Curve (FLC). Stress based damage models are able to do this. However, the parameterisation of such models has not yet been standardised. In this study a butterfly specimen geometry, which was developed at the Institute for Forming Technology and Machines (IFUM), was used for a stress state dependent fracture characterisation. The fracture behaviour of two AHSS, CP800 and DP1000, at varied stress states between pure shear and uniaxial loading was characterised by an experimental-numerical approach. For variation of the stress state, the specimen orientation relative to the force direction of the uniaxial testing machine was orientated at different angles. In this way, the relevant displacement until fracture initiation was determined experimentally. Subsequently, the experimental tests have been numerically reproduced giving information about the strain and stress evolution in the crack impact area of the specimen for the experimentally identified fracture initiation. With the help of this testing procedure, two different stress-based damage models, Modified Mohr-Coulomb (MMC) and CrachFEM, were parameterised and compared.

Axial Compressive Behavior of Single-Stage Bellows of TiNi Shape Memory Alloy for Seismic Applications

2005 ◽  
Vol 475-479 ◽  
pp. 2055-2058 ◽  
Author(s):  
Hiromasa Semba ◽  
Nagatoshi Okabe ◽  
Toru Yamaji ◽  
Keisuke Okita ◽  
Kiyoshi Yamauchi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Large Strain ◽  
Axial Direction ◽  
Single Stage ◽  
Seismic Protection ◽  
Compression Tests ◽  
Compressive Behavior ◽  
Heat Treated ◽  
Energy Absorbing

The bellows formed of TiNi shape memory alloy (SMA) is proposed as a new type of seismic protection device. The bellows structure is known to have lower rigidity along the axial direction through effect of its shape. TiNi is known to be one of the most typical SMAs, which have high damping characteristics for dynamics engaged in its twin formation under martensite state and have the ability to recover completely from the large strain after unloaded and or heated. In this study, fundamental compressive behavior of TiNi bellows was investigated and discussed. Several shapes of TiNi single-stage bellows produced by rubber bulge method were prepared. They were heat-treated for some heat treatments and then examined on compression tests. Based on the results, the relationships among the bellows shapes and the stiffness, energy-absorbing capacity and so on were clarified. Finally, it was found from these results that single-stage bellows of TiNi SMA could be used as one of seismic protection devices.

Microstructure and Compressive Behaviour of 3D Needled C/SiC Composites

2011 ◽  
Vol 194-196 ◽  
pp. 1599-1606 ◽  
Author(s):  
Shang Wu Fan ◽  
Li Tong Zhang ◽  
Lai Fei Cheng ◽  
Fang Xu
Keyword(s):  
Carbon Fiber ◽  
Chemical Vapor ◽  
Axial Direction ◽  
Short Fiber ◽  
Chemical Vapor Infiltration ◽  
Fiber Bundles ◽  
Compressive Behavior ◽  
Compressive Behaviour ◽  
Melt Infiltration ◽  
Sic Composites

The 3D needled C/SiC composites were fabricated by chemical vapor infiltration combined with liquid melt infiltration. The microstructure and compressive behavior of 3D needled C/SiC composites were investigated. The results indicated that the 3D needled C/SiC composites were composed of the layers of 0 ° non-woven fiber cloth, short fiber web, 90 ° non-woven fiber cloth, and needle fibers. The materials were composed of carbon fiber, PyC, Si, and SiC. SiC and Si were mostly distributed in the short fiber web layers. Local C/C units (local carbon fiber reinforced PyC) were formed in the fiber bundles of non-woven fiber cloth. A great deal of pores and cracks existed in the 3D needled C/SiC composites. The pores less than 10 μm were generally located in the non-woven cloth layers, while the big pores were in the short fiber web layers. The cracks were regularly presented in the Si and SiC region of the composites and were normal to the axial direction of the fiber bundles. The compressive strengths perpendicular and parallel to the non-woven fiber cloth were about 118±18 MPa and 260±41 MPa, respectively. The compressive fractography revealed stepwise fracture along fiber layers direction.

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