弯曲试件上边缘裂缝和砂浆-砂浆界面间的影响研究
THE MUTUAL INFLUENCE BETWEEN EDGE CRACKS ON SEMI-CIRCULAR BENDING SPECIMENS AND MORTAR MORTAR INTERFACE(DIFFERENT INCLINATION ANGLES)
程宏图1
作者信息
- 1. 中铁十四局集团隧道工程有限公司,济南 250014
- 折叠
摘要
研究分析了边缘裂缝(缺口)与砂浆-砂浆界面的相互作用对半圆形弯曲(SCB)试件力学性能的影响.在实验中,对不同砂浆-砂浆界面角度和不同接缝长度的SCB试件进行了实验测量.在0.004 mm/min的受力速率下,制备出了直径为10 cm且有不同长度边缘裂缝的SCB样品,并在实验室进行了试验,界面抗拉强度为0.15 MPa,接头抗拉断裂韧性为0.28 MPa√m.上述实验表明,裂缝(缺口)长度和界面角度(与加载方向相关)在很大程度上决定了SCB试件的破坏和破裂过程.同时,利用PFC2 D中的粒子折叠码(颗粒流代码)对实验测试的SCB试样进行了模拟.
Abstract
This article investigates the influence of the interaction between edge cracks(notches)and the mortar mortar interface on the mechanical properties of semi-circular bending(SCB)specimens.In the experiment,SCB specimens with different mortar mortar interface angles and different joint lengths were measured.Under a force rate of 0.004 mm/min,SCB samples with a diameter of 10 cm and edge cracks of different lengths were prepared and tested in the laboratory.The interfacial tensile strength was 0.15 MPa,and the joint tensile fracture toughness was 0.28 MPa √ m.These experiments indicate that the length of cracks(notches)and interface angle(related to loading direction)largely determine the failure and fracture process of SCB specimens.At the same time,the particle folding code(particle flow code)in PFC2D was used to simulate the SCB samples tested in the experiment.
关键词
砂浆界面/裂缝长度/界面角度/PFC2D/半圆形弯曲(SCB)试验Key words
mortar interface/crack length/interface angle/PFC2D/semi circular bending(SCB)test引用本文复制引用
出版年
2024
NETL
NSTL
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