scholarly journals Mechanical Response and Energy Dissipation Analysis of Heat-Treated Granite Under Repeated Impact Loading

2019 ◽  
Vol 59 (1) ◽  
pp. 275-296 ◽  
Author(s):  
Zhiliang Wang ◽  
Nuocheng Tian ◽  
Jianguo Wang ◽  
Shengqi Yang ◽  
Guang Liu
Keyword(s):  
Energy Dissipation ◽  
Impact Loading ◽  
Mechanical Response ◽  
Repeated Impact ◽  
Heat Treated

scholarly journals A Simplified Analytical Solution of Mechanical Responses of Soil Subjected to Repeated Impact Loading

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Futian Zhao ◽  
Jun Liu ◽  
Zhimin Xiao ◽  
Mingqing Liu ◽  
Yue Wang ◽  
...  
Keyword(s):  
Analytical Solution ◽  
Dynamic Response ◽  
Hollow Cylinder ◽  
Impact Loading ◽  
Dynamic Stress ◽  
Mechanical Response ◽  
Impact Load ◽  
Projection Area ◽  
Response Model ◽  
Repeated Impact

A simplified dynamic response model is proposed based on the deformation and dynamic stress response characteristics of soil under impact loading. The foundation is divided into two distinct zones: a projection cylinder acting vertically under impact loading and a hollow cylinder outside the projection area. It is assumed that the ramming deformation of the projected cylinder under the vertical impact load is a quasi-static loading process under the maximum contact dynamic stress through the quasi-static method, and the settlement calculation without lateral deformation is given. It is assumed that the inner wall of the hollow cylinder is subjected to horizontal lateral pressure and the analytical solution of the horizontal dynamic stress considering the plastic deformation of soil is given. The simplified dynamic response model can reflect the mechanical response of soil under impulse train load well which can provide reference for similar projects.

scholarly journals Experiments on Mechanical Response and Energy Dissipation Behavior of Rockburst-Prone Coal Samples Under Impact Loading

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Jinbao Tang ◽  
Sheng Li ◽  
Guangsheng Qin ◽  
Wanjie Lu ◽  
Zhijie Zhu ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Energy Dissipation ◽  
Strain Rate ◽  
Impact Loading ◽  
Mechanical Response ◽  
Peak Stress ◽  
Dynamic Elastic Modulus ◽  
Dissipated Energy ◽  
Peak Strain ◽  
Dynamic Mechanical

To reveal the dynamic mechanical response and energy dissipation behavior of rockburst-prone coal samples under impact loading, the compressive experiments on Xinzhouyao coals (prone) and Machang coals (nonprone) under different impact loadings were carried out using the Split Hopkinson Pressure Bar (SHPB). The dynamic mechanical properties were studied, including dynamic elastic modulus, strain rate, peak stress, peak strain, dynamic increment factor, and energy dissipation. The results show that the dynamic elastic modulus, peak stress, and peak strain of both prone and nonprone coals perform an obvious correlation with the increase of strain rate. The strain rate strengthening effect on the dynamic elastic modulus and compressive strength of rockburst-prone coal samples are more significant, reflected by the greater increment with the increase of strain rate, while the dynamic increment factors of both prone and nonprone coals show apparent strain rate strengthening. The incident, reflected, and transmitted energy of both two coals linearly increases with the impact velocity, although the increased rate may be different. The dissipated energy of rockburst-prone coal samples increases faster, while the rate of the increase of the dissipated energy is more stable with strain rate. The results may provide an important reference for revealing the failure law of engineering-scaled coal mass suffered by rockburst.

scholarly journals High-strain-rate mechanical response of HTPE propellant under SHPB impact loading

AIP Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 035145
Author(s):  
Heng-ning Zhang ◽  
Hai Chang ◽  
Jun-qiang Li ◽  
Xiao-jiang Li ◽  
Han Wang
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Impact Loading ◽  
Mechanical Response ◽  
High Strain

Evaluation of Cumulative Damage of RC Members under Repeated Impact Loading

2015 ◽  
Vol 784 ◽  
pp. 500-507 ◽  
Author(s):  
Hiroki Tamai ◽  
Yoshimi Sonoda
Keyword(s):  
Impact Loading ◽  
Structural Engineering ◽  
Damage Mechanics ◽  
Continuum Damage Mechanics ◽  
Numerical Approach ◽  
Cumulative Damage ◽  
Impact Behavior ◽  
Low Velocity ◽  
Repeated Impact ◽  
Applicability Limit

In the civil and structural engineering field, there are so many problems regarding act of impact loading against some structures due to natural disaster. So it is important to evaluate the damage condition of them after impact loading, and to estimate the residual performance of them. This study is focused on a reinforced concrete (herein after called RC) structure such as caisson breakwater and rock-shed. In order to quantitatively evaluate the dynamic behavior and cumulative damage of RC members under low-velocity single and repeated impact loading, we conducted numerical approach by using the theory of Continuum Damage Mechanics (herein after called CDM). At the result, we clarified not only impact behavior of the members but also the relationship between cumulative kinetic energy of repeated impact loading and cumulative damage of the members. In addition, applicability limit of our model based on scalar damage modeling was clarified.

Characterization of Multi-Phase and Multi-Component Polymer Systems Using the Atomic Force Microscope

1999 ◽  
Vol 5 (S2) ◽  
pp. 962-963
Author(s):  
M. VanLandingham ◽  
X. Gu ◽  
D. Raghavan ◽  
T. Nguyen
Keyword(s):  
Energy Dissipation ◽  
Atomic Force Microscope ◽  
Mechanical Response ◽  
Sample Surface ◽  
Phase Changes ◽  
Phase Imaging ◽  
Polymer Systems ◽  
Atomic Force ◽  
Phase Images ◽  
Multi Phase

Recent advances have been made on two fronts regarding the capability of the atomic force microscope (AFM) to characterize the mechanical response of polymers. Phase imaging with the AFM has emerged as a powerful technique, providing contrast enhancement of topographic features in some cases and, in other cases, revealing heterogeneities in the polymer microstructure that are not apparent from the topographic image. The enhanced contrast provided by phase images often allows for identification of different material constituents. However, while the phase changes of the oscillating probe are associated with energy dissipation between the probe tip and the sample surface, the relationship between this energy dissipation and the sample properties is not well understood.As the popularity of phase imaging has grown, the capability of the AFM to measure nanoscale indentation response of polymers has also been explored. Both techniques are ideal for the evaluation of multi-phase and multi-component polymer systems.

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