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用断裂力学理论研究带裂纹材料和构件的强度及裂纹扩展的规律,自五十年代开始,首先在金属材料特别是高强度合金材料方面,取得了较大的进展.六十年代开始,断裂力学在水工结构中的应用开始被人们重视起来.国内外就混凝土的断裂准则和断裂韧度的测试已发表了不少有价值的研究成果.而断裂力学在砌石体材料上的应用,国内外尚未见到报导.1984年,我们借用金属材料测定断裂韧度的方法,对变厚度砌石体试件进行了测定.试验表明在测试范围内,砌石体的临界应力强度因子K_1.与试件厚度无关.在这个基础上,我们又进行了变平面尺寸试件的K_1.测试,目的在于比较全面的探讨用断裂力学理论解决带裂纹的砌石体材料的可行性和裂纹扩展的规律.
Fracture mechanics theory has been used to study the strength and crack propagation of cracked materials and structural members. Since the 1950s, great progress has been made in the field of metallic materials, especially high-strength alloy materials. Since the 1960s, fracture mechanics The application in the hydraulic structure began to be valued.China at home and abroad on the fracture criteria and fracture toughness test has published many valuable research results.However, the application of fracture mechanics in masonry materials, the domestic In 1984, we used the method of determining the fracture toughness of metal materials to test the variable thickness of the stone masonry specimen.The test shows that the critical stress intensity factor K1 of the masonry within the test range On the basis of this, we conducted a K_1 test of the specimen with variable plane dimensions, aiming at a more comprehensive discussion of the feasibility of solving the cracked masonry material with the theory of fracture mechanics and the law of crack propagation .