Energy Absorbing Properties Analysis of Layers Structure of Titanium Alloy Ti6Al4V during Dynamic Impact Loading Tests

This paper presents the testing methodology of specimens made of layers of titanium alloy Ti6Al4V in dynamic impact loading conditions. Tests were carried out using a drop-weight impact tower. The test methodology allowed us to record parameters as displacement or force. Based on recorded data, force and absorbed energy curves during plastic deformation and sheet perforation were created. The characteristics of the fractures were also analyzed. The impact test simulation was carried out in the ABAQUS/Explicit environment. Results for one, two, and three layers of titanium alloy were compared. The increase in force required to initialize the damage and the absorbed energy during plastic deformation can be observed with an increase in the number of layers. The increase in absorbed energy is close to linear. In the simulation process, parameters such as Huber–Mises–Hencky stress value, equivalent plastic strain, temperature increase, and stress triaxiality were analyzed.

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The Effects of Specimen Geometry on the Plastic Deformation of AA 2219-T8 Aluminum Alloy Under Dynamic Impact Loading

Journal of Materials Engineering and Performance ◽

10.1007/s11665-017-3061-4 ◽

2017 ◽

Vol 26 (12) ◽

pp. 5837-5846 ◽

Cited By ~ 6

Author(s):

G. M. Owolabi ◽

D. T. Bolling ◽

A. G. Odeshi ◽

H. A. Whitworth ◽

N. Yilmaz ◽

...

Keyword(s):

Plastic Deformation ◽

Aluminum Alloy ◽

Impact Loading ◽

Specimen Geometry ◽

Dynamic Impact ◽

Dynamic Impact Loading

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3D Physical Modelling Study of Shield-Strata Interaction under Roof Dynamic Loading Condition

Shock and Vibration ◽

10.1155/2021/6618954 ◽

2021 ◽

Vol 2021 ◽

pp. 1-7

Author(s):

Shengli Yang ◽

Hao Yue ◽

Gaofeng Song ◽

Junjie Wang ◽

Yanyao Ma ◽

...

Keyword(s):

Impact Loading ◽

Loading Condition ◽

Impact Load ◽

Physical Modelling ◽

Coal Face ◽

Dynamic Impact ◽

Immediate Roof ◽

Cutting Height ◽

The Impact ◽

Dynamic Impact Loading

The dynamic hazards in the open face area caused by the impact load of the massive strong roof become increasingly severe with the increase in the cutting height of the longwall face and its depth of cover. Understanding the strata-shield interaction under the dynamic impact loading condition may relieve the dynamic hazards. In this paper, a 3D physical modelling platform is developed to study the interaction between the roof strata and the longwall shield under the dynamic impact load conditions. A steel plate is dropped to the coal face wall at a certain height above the immediate roof to simulate the free fall of the main roof and the dynamic impact loading environment. The occurrence of major roof falls is modelled at different height above the model and at different positions relative to the longwall faceline. The large-cutting-height and top-coal-caving mining methods are modelled in the study to include the nature of the immediate roof. The results show that the level of face and roof failures depends on the magnitude of the dynamic impact load. The position and height of the roof fall have an important influence to the stability of the roof and face. The pressures on the shield and the solid coal face are relieved for the top-coal-caving face as compared to the large-cutting-height face.

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Influence of Carburization on Mechanical Behaviors of NiTiCu Alloy under Dynamic Impact Loading

Materials Science Forum ◽

10.4028/www.scientific.net/msf.546-549.2233 ◽

2007 ◽

Vol 546-549 ◽

pp. 2233-2236

Author(s):

Ren Bo Xu ◽

Li Shan Cui ◽

Yan Jun Zheng

Keyword(s):

Contact Force ◽

Impact Loading ◽

Processing System ◽

Impact Testing ◽

Mechanical Behaviors ◽

Absorbed Energy ◽

Dynamic Impact ◽

Signal Processing System ◽

Impact Process ◽

Dynamic Impact Loading

The mechanical behaviors of bare and carburized NiTiCu specimens under dynamic impact loading were investigated using a home-built impact testing system. The contact force was measured with piezoelectric force sensor and digital signal processing system in real time during impact process. Predicted instantaneous velocity and displacement formula were presented. The results show that the maximum deformation depth of carburized specimens was less than that of bare specimens, and the carburization process can increase absorbed energy and cushion effect to impact of specimens during impact process. The decrease of deformation depth and increase of absorbed energy can reduce the contact force and materials damage of specimens during impact process.

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Comparative Shear Tests of Bolt Rods Under Static and Dynamic Loading

Studia Geotechnica et Mechanica ◽

10.2478/sgem-2019-0038 ◽

2020 ◽

Vol 42 (2) ◽

pp. 151-167

Author(s):

Andrzej Pytlik

Keyword(s):

Impact Loading ◽

Load Capacity ◽

Assessment Process ◽

Shear Tests ◽

Dynamic Impact ◽

Similar Work ◽

Mathematical Relationships ◽

The Impact ◽

Dynamic Impact Loading ◽

Single Shear

AbstractThis article presents the methodology and results of single shear tests of bolt rods under dynamic impact loading generated by means of a drop hammer. Comparative analysis was also performed for bolt rod load capacity, stress and shear work under static and dynamic (impact) loading. The developed method of single shear testing of bolt rods under impact loading makes it possible to obtain repeatable test results concerning maximum bolt rod shearing force, shear stress and shear work values.Comparative shear tests of four types of bolt rods under static and impact loading showed that the APB-type bolt rods made of AP770 steel, which was characterised by having the highest strength, exhibited the greatest shear work. AM22-type bolt rods exhibited a very similar work value. Though the AM22-type bolt rods made of A500sh steel demonstrated lower strength than the APB-type bolts, as well as a smaller diameter and cross section, they dissipated the impact energy better thanks to their higher plasticity. This could indicate the direction of optimisation for bolt rods in order to increase their impact strength.Mathematical relationships were also formulated for selected tests, describing the real single shear courses F d =f(t) of bolts under impact loading. The obtained relationships could be applied in the load assessment process of bolt rods intended for use under roof caving, tremor and rock burst conditions.

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Plastic deformation in relation to microstructure and texture evolution in AA 2017-T451 and AA 2624-T351 aluminum alloys under dynamic impact loading

Materials Science and Engineering A ◽

10.1016/j.msea.2015.03.113 ◽

2015 ◽

Vol 636 ◽

pp. 379-388 ◽

Cited By ~ 29

Author(s):

A.A. Tiamiyu ◽

Ritwik Basu ◽

A.G. Odeshi ◽

Jerzy A. Szpunar

Keyword(s):

Plastic Deformation ◽

Aluminum Alloys ◽

Impact Loading ◽

Texture Evolution ◽

Dynamic Impact ◽

Dynamic Impact Loading

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Testing Study on Damage Fracture Responses of Rock under Dynamic Impact Loading

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.255-260.1815 ◽

2011 ◽

Vol 255-260 ◽

pp. 1815-1819 ◽

Cited By ~ 1

Author(s):

Ping Cao ◽

Yi Xian Wang ◽

Kai Wen Xia

Keyword(s):

Crack Length ◽

Impact Velocity ◽

Impact Loading ◽

Test Results ◽

Dynamic Impact ◽

Destructive Effect ◽

Propagation Length ◽

Break Area ◽

The Impact ◽

Dynamic Impact Loading

The dynamic impact loading has the destructive effect to the surrounding rock mass. Rock specimen such as rock plate was found to become invalid under dynamic impact loading. This paper presents brittle damage evolution law for dynamic impact damage of brittle rock based on low velocity (10m/s~40m/s) impact test, when a source of impact loading is applied to a rock plate specimen, damage cracks are developed from the source to the boundaries. This paper is concerned with the description and explanation of this phenomenon. The test results show that the cracks propagation length and break area are not arbitrary, but are influenced by the angle of dynamic impact loading. According to the test results, the study found that the scope of impact resistance optimization angle is about 30°~45°, and the cuspidal point of impact velocity is about 30m/s~35m/s; The crack length and the break area increase with the increase of the impact loading; When the break area decreases abruptly, the crack length increases suddenly, which shows that there was an obvious incubation period of crack forming, at first some pits appearing on the verge of the rock plate and the propagation rate of crack length and break area decreasing with the impact velocity increasing.

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