CAJ | 학술논문

借助于ANSYA/LS-DYNA数值分析软件对SHPB试验进行数值模拟，就不同应变率对砂岩力学性能的影响进行了研究，探讨了不同应变率对砂岩峰值应力、弹性模量、软化模量的影响规律，系统地分析了砂岩在不同应变率作用下的破坏规律。结果表明：随着应变率的增加，峰值应力显著增加，表现出较强的应变率相关性；应变率增大，弹性模量随之增大，但增长速率逐渐减小；应变率越大，软化模量反而降低。应变率·ε从632.4 s-1变化到752.5 s-1时，软化模量由-2.98降到-4.18，降低了28.71豫；当应变率·ε大于752.5 s-1为1757.9时，软化模量仅降低了5豫，说明应变率较大时变化趋势较为缓慢。高应变率下砂岩试件的动态压缩破坏主要呈现为轴向劈裂破坏。
차조우ANSYA/LS-DYNA수치분석연건대SHPB시험진행수치모의，취불동응변솔대사암역학성능적영향진행료연구，탐토료불동응변솔대사암봉치응력、탄성모량、연화모량적영향규률，계통지분석료사암재불동응변솔작용하적파배규률。결과표명：수착응변솔적증가，봉치응력현저증가，표현출교강적응변솔상관성；응변솔증대，탄성모량수지증대，단증장속솔축점감소；응변솔월대，연화모량반이강저。응변솔·ε종632.4 s-1변화도752.5 s-1시，연화모량유-2.98강도-4.18，강저료28.71예；당응변솔·ε대우752.5 s-1위1757.9시，연화모량부강저료5예，설명응변솔교대시변화추세교위완만。고응변솔하사암시건적동태압축파배주요정현위축향벽렬파배。
Conducting a numerical simulation of the SHPB experimental data through ANSYA/LS-DYNA,the present paper studies the impact of different strain rates on the mechanical property of sandstone and investigates the effect law of different strain rates on the peak stress,elastic modulus and softening modulus of sandstone,offering a systematic analysis of the damage law of sandstone under different strain rates. The findings reveal that the peak stress shows a notable increase as the strain rate increases and that the two exhibit a strong correlation. Experimental data shows that the elastic modulus will increase as the strain rate increases,but the rate of increase will decrease gradually. When the strain rate increases,the softening modulus will actually decrease. Experimental data also shows that when the strain rate ·ε varies from 632. 4 s-1 to 752. 5 s-1 ,the softening modulus will decrease from -2. 98 to-4. 18,showing a 28. 71% decrease while the softening modulus only shows a 5% decrease when the value of strain rate ·ε is greater than 752. 5 s-1 at 1757. 9,which indicates that when the strain rate is comparatively greater,the var-iation trend will become relatively gentle. The experiment also finds that the dynamic compression fracture of the sample sandstone under high strain rate demonstrates the fashion of an axial splitting fracture.