基于SPH法的磨料射流破损混凝土裂纹扩展及损伤分析  

Concrete crack propagation and damage analysis of damage based on SPH method of abrasive jet

作　　者：陈尉 马小晶[1] CHEN Wei;MA Xiaojing(School of Electrical Engineering,Xinjiang University,830047 Urumqi,China)

机构地区：[1]新疆大学电气工程学院,乌鲁木齐830047

出　　处：《应用力学学报》2024年第4期916-927,共12页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.11762021);新疆维吾尔自治区自然科学基金资助项目(No.2017D01C085)。

摘　　要：为研究射流冲击下混凝土的破损机理与裂纹扩展规律,基于光滑粒子流体动力学(smooth particle hydrodynamics,SPH)方法建立了磨料水射流冲击混凝土的数值模型,研究了混凝土内部的应力传播和破损方式,磨料体积分数和混凝土的孔隙率与裂纹长度、失效粒子数、坑深和坑径之间的关系。研究表明:裂纹对应力具有强阻碍作用,与边界应力波的反射叠加会使得应力区域性集中,形成中心微裂纹,以及内部破碎块;磨料体积分数为20%与0%相比,裂纹长度增加2.30倍,失效粒子数增加3.38倍,坑深值增加4.00倍,证明射流中添加磨料会大幅提高破损效果;混凝土的孔隙率越大,裂纹分布越发散,损伤区域面积、损伤程度和分形维数越大,证明孔隙会降低混凝土的抗压强度,孔隙率大的材料更易受损。In order to explore the breakage mechanism and crack expansion pattern of concrete under jet impact,a numerical model of abrasive water jet impacting concrete was constructed based on smooth particle hydrodynamics(SPH)method.The relationship of stress propagation and breakage mode inside concrete,abrasive volume fraction and porosity of concrete with crack length,failure particle number,pit depth and pit diameter was investigated.It is indicated that cracks have strong hindering effect on stresses,and the superposition of reflections with boundary stress waves cause stress concentration in some regional,forming the central microcracks and internal broken blocks.The crack length increased by nearly 2.30 times,the number of failed particles by 3.38 times,and the pit depth value by 4.00 times,with abrasive volume fraction of 20%compared to 0%,indicating that the addition of abrasives to the jet substantially increased the breakage effect.The greater porosity of concrete is,the more diffuse cracks distribute,the larger of damage area,the greater of damage degree,and the greater fractal dimension are,indicating that porosity reduces the concrete compressive strength and that materials with large porosity are more prone to breakage.

关 键 词：磨料水射流 混凝土 等效应力 裂纹 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3