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针对复合板材在工程应用中的力学性能分析需求,为测量其平行于试件面板方向的剪切破坏荷载,以能够较准确表征复合板材双剪状态下的应力分布情况,研究了复合板材双剪切试验方法,设计了双剪切试验装置,并对不同芯材和不同厚度的结构保温板进行了双剪切试验,分析了其破坏形态和剪切力学性能。研究结果表明:各试件双剪切破坏面形态合理,应力-应变曲线数据稳定;EPS(聚苯乙烯泡沫)芯材试件抗剪破坏形式为脆性破坏,而岩棉芯材试件受剪开裂后,抗剪强度不会立即丧失,而是逐渐降低;随着试件芯材厚度的增加,EPS芯材试件应力峰值和应变随之减小,两者变化均为非线性,而岩棉芯材试件应力峰值随之减小,应变则无明显相关关系。该方法与装置为进一步研究复合板材的力学性能提供了试验方法。
In order to analyze the mechanical properties of composite sheet in engineering application, in order to measure the shear failure load parallel to the specimen panel, in order to be able to more accurately characterize the stress distribution of the composite sheet under double shear state, Cut test method, designed a double shear test device, and different core materials and different thickness of the thermal insulation board double shear test, analysis of the failure morphology and shear mechanical properties. The results show that the double shear failure surface of each specimen has a reasonable shape and the data of stress-strain curve are stable. The shear failure mode of EPS (polystyrene foam) core specimen is brittle failure, while the rockwool core specimen is sheared After the cracking, the shear strength will not be immediately lost, but gradually reduced. With the increase of specimen core thickness, the peak stress and strain of EPS core specimen decrease with the change of both being nonlinear. The stress peak of the cotton core specimen decreases and the strain has no obvious correlation. The method and the device provide a test method for further studying the mechanical properties of the composite board.