裂纹止裂技术及裂纹动态扩展规律研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (4) : 38-48.

论文

裂纹止裂技术及裂纹动态扩展规律研究

郎林1,2，朱哲明1,2，万端莹1,2，邓帅1,2，王磊1,2，王兴渝1,2

作者信息 +

A study on crack arrest technology and dynamic propagation law of crack

LANG Lin1,2，ZHU Zheming1,2，WAN Duanying1,2，DENG Shuai1,2，WANG Lei1,2，WANG Xingyu1,2

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摘要

为了对动态荷载作用下水泥粉煤灰砂浆的裂缝动态扩展行为进行研究，提出了一种大尺寸带V型底边的半圆边裂纹(SECVB)试件,其V形底部具有止裂功能。SECVB试件的V形底部设计为180°，150°和120°三个角度。采用落锤冲击装置进行了冲击试验，并使用裂纹扩展计(CPG)用于测量裂纹扩展的相关参数。利用有限差分程序AUTODYN对裂纹扩展行为进行了数值模拟，并用有限元程序ABAQUS计算了裂纹的动态应力强度因子(DSIF)；根据CPG测量的裂纹萌生时间和扩展时间来确定临界应力强度因子。试验和数值模拟结果表明，SECVB试件适合于研究动态荷载作用下水泥粉煤灰砂浆的裂纹扩展行为和止裂行为。在裂纹扩展过程中，裂纹可能在一段时间内止裂，并且裂纹在起始时刻的断裂韧度高于裂纹扩展时的断裂韧度。

Abstract

In order to study the crack dynamic propagation behavior of cement fly ash mortar under dynamic loading, a large-scale semi-circular edge crack with V-shaped bottom (SECVB) specimen was proposed.The V-shaped bottom has crack arrest function and has three angles of 180, 150 and 120 degrees.Impact tests were carried out with a drop impact device, and crack propagation parameters were measured with Crack propagation gauges (CPGs).The finite difference code AUTODYN was used to simulate the crack propagation behavior, and the finite element program ABAQUS was used to calculate the dynamic stress intensity factor (DSIF).The critical stress intensity factor was determined according to the crack initiation time and propagation time measured by CPG.Experimental and numerical results show that SECVB specimens are suitable for studying crack propagation and crack arrest behavior of cement fly ash mortar under dynamic loading.In the process of crack propagation, the crack may stop for a period of time, and the fracture toughness of cement fly ash mortar crack at the beginning is higher than that of crack propagation.

导出引用

郎林1,2，朱哲明1,2，万端莹1,2，邓帅1,2，王磊1,2，王兴渝1,2. 裂纹止裂技术及裂纹动态扩展规律研究[J]. 振动与冲击, 2020, 39(4): 38-48

LANG Lin1,2，ZHU Zheming1,2，WAN Duanying1,2，DENG Shuai1,2，WANG Lei1,2，WANG Xingyu1,2. A study on crack arrest technology and dynamic propagation law of crack[J]. Journal of Vibration and Shock, 2020, 39(4): 38-48

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