Dynamic mechanical behavior and damage constitutive model of shales with different bedding under compressive impact loading

2021 ◽  
Vol 14 (17) ◽  
Author(s):  
Xueru Fan ◽  
Ning Luo ◽  
Yishuo Yuan ◽  
Hanliang Liang ◽  
Cheng Zhai ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Mechanical Behavior ◽  
Impact Loading ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Behavior ◽  
Damage Constitutive Model

Dynamic Constitutive Model of Concrete

2012 ◽  
Vol 450-451 ◽  
pp. 379-382
Author(s):  
Wei Wu Yang ◽  
Hai Feng Liu ◽  
Jian Guo Ning
Keyword(s):  
Constitutive Model ◽  
Mechanical Behavior ◽  
Failure Criterion ◽  
Impact Loading ◽  
Experimental Results ◽  
Dynamic Mechanical ◽  
Criterion A ◽  
Dynamic Mechanical Behavior ◽  
Model Predictions

Based on the damage and Ottosen failure criterion, a dynamic constitutive model is proposed to investigate the mechanical behavior of concrete subjected to impact loading. The model predictions fit well with experimental results. So it can be used to simulate dynamic mechanical behavior of concrete

Dynamic Mechanical Properties of Porous Rock under Impact Loading

2011 ◽  
Vol 228-229 ◽  
pp. 5-9
Author(s):  
Yong Xiang Dong ◽  
Chang Jing Xia ◽  
Li Xing Xiao ◽  
Shun Shan Feng
Keyword(s):  
Mechanical Behavior ◽  
Impact Loading ◽  
Split Hopkinson Pressure Bar ◽  
Rock Fracture ◽  
Wave Theory ◽  
Hopkinson Pressure Bar ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Behavior ◽  
Rock Porosity ◽  
The Impact

Dynamic impact experiments of man-made rock were carried out with the Split Hopkinson Pressure Bar (SHPB) apparatus in this paper. The impact process was analyzed and the influence of rock porosity on dynamic mechanical behavior was investigated. The stress-strain curves in rock were obtained by the one-dimensional stress wave theory. The curve lays foundation for numeric simulation of rock fracture under impact loading. The damage profiles of rock specimen under the impact loading show that the man-made rock exhibits obvious shear damage under the impact loading because it is a typical porous medium containing large quantities of defects such as pores, cracks and grain boundaries at the microscale. The experimental results also indicated that rock porosity plays an important role in dynamic mechanical behavior.

scholarly journals Mechanical Behaviors of Flax Fiber-Reinforced Composites at Different Strain Rates and Rate-Dependent Constitutive Model

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 854 ◽  
Author(s):  
Dayong Hu ◽  
Linwei Dang ◽  
Chong Zhang ◽  
Zhiqiang Zhang
Keyword(s):  
Constitutive Model ◽  
Strain Rate ◽  
Mechanical Behavior ◽  
Flax Fiber ◽  
Fiber Reinforced Composites ◽  
Strain Rates ◽  
Reinforced Composites ◽  
Dynamic Mechanical ◽  
Rate Dependent ◽  
Dynamic Mechanical Behavior

Flax fiber-reinforced composites (FFRCs) exhibit excellent environmentally friendly qualities, such as light weight, low cost, recyclability, and excellent mechanical properties. Understanding the dynamic mechanical behavior of FFRCs could broaden their potential applications in lightweight, crashworthy, and impact-critical structures. This study presents a study on the fabrication of FFRCs by vacuum-assisted resin infusion. The dynamic stress–strain responses of the fabricated specimens at strain rates ranging from 0.006 s-1 to 2200 s-1 were evaluated using quasi-static tests and the Split–Hopkinson pressure bar (SHPB). The results indicated that the FFRC exhibited superior strain rate sensitivity. Final deformation photographs and scanning electron micrographs clearly revealed the damage evolution of the FFRC specimens, as well as various failure mechanisms, including fiber–matrix debonding, fiber pull-out, and fiber fracture at different strain rates. On the basis of the experimental results, a simplified Johnson–Cook model was established to describe the strain-rate dependent constitutive model of FFRC. The validation of the suggested constitutive model was embedded in the finite element simulations and could well repeat the strain wave observed from the experiment results. Finally, the quasi-static compression and drop-hammer impact of pyramidal lattice structures with FFRC cores were investigated both numerically and experimentally, proving the effectiveness of the simplified Johnson–Cook model. This study could potentially contribute to a deeper understanding of the dynamic mechanical behavior of FFRCs and provide fundamental experimental data for future engineering applications.

scholarly journals Experimental and Constitutive Model Study on Dynamic Mechanical Behavior of Metal Rubber under High-Speed Impact Loading

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Youchun Zou ◽  
Chao Xiong ◽  
Junhui Yin ◽  
Kaibo Cui ◽  
Xiujie Zhu ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Mechanical Behavior ◽  
Energy Absorption ◽  
Split Hopkinson Pressure Bar ◽  
High Energy ◽  
Property A ◽  
Stress Strain ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Behavior ◽  
Metal Rubber

The development of lightweight, impact-resistant, and high energy-consuming materials is of great significance for improving the defense capabilities of military equipment. As a new type of damping material, metal rubber has demonstrated great potential for application in the field of impact protection. In this paper, the dynamic mechanical response of metal rubber under a high strain rate is studied, which provides a new idea for developing high-performance protective materials. The stress-strain curves, energy absorption performance, and wave transmission performance of metal rubber at various strain rates were investigated based on a split-Hopkinson pressure bar (SHPB) device. The dynamic stress-strain curve of metal rubber is divided into three stages: elastic stage, plastic stage, and failure stage. The optimal energy absorption efficiency is greater than 0.5, and the maximum value can reach 0.9. The wave transmittance is less than 0.01. The dynamic mechanical tests have proved that metal rubber has excellent energy absorption capacity and impact resistance property. A constitutive model based on Sherwood–Frost was established to predict the dynamic mechanical behavior of metal rubber. The results of comparison between the calculation and the experiment show that the constitutive model can accurately predict the dynamic mechanical performance of metal rubber.

scholarly journals Dynamic Mechanical Behavior and Numerical Simulation of Frozen Soil under Impact Loading

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
Dan Zhang ◽  
Zhiwu Zhu ◽  
Zhijie Liu
Keyword(s):  
Mechanical Behavior ◽  
Impact Loading ◽  
Dynamic Mechanical Properties ◽  
Frozen Soil ◽  
Element Analysis ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Behavior ◽  
The Finite Element Analysis ◽  
Split Hopkinson ◽  
Impact Experiments

Split Hopkinson pressure bars (SHBP) were used to perform impact experiments on frozen soil under various impact velocities and temperatures to analyze the effect of these parameters on the mechanical behavior of the soil. Based on the Holmquist-Johnson-Cook constitutive model, the dynamic mechanical properties under impact loading were analyzed. The SHPB experiments of frozen soil were also simulated using the finite element analysis software LS-DYNA, and the simulation results were similar to the experimental results. The temperature effect, strain rate effect, and the destruction process of the frozen soil as well as the propagation process of stress waves in the incident bar, transmission bar, and frozen soil specimen were investigated. This work provides a good theoretical basis and technical support for frozen soil engineering applications.

Dynamic Mechanical Behavior of Hybrid Flax/Basalt Fiber Polymer Composites

2021 ◽  
pp. 305-312
Author(s):  
Arun Prasath Kanagaraj ◽  
Amuthakkannan Pandian ◽  
Veerasimman Arumugaprabu ◽  
Rajendran Deepak Joel Johnson ◽  
Vigneswaran Shanmugam ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Polymer Composites ◽  
Basalt Fiber ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Behavior
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