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用混合有限元法,采用四边形等参单元算得三点弯曲梁和四点剪切梁的应力强度因子K_Ⅰ和K_Ⅱ。用对称三点弯曲梁和四点剪切梁试件测得陶粒砼K_(IC)和Ⅰ-Ⅱ复合型裂纹的临界K_Ⅰ、K_Ⅱ值。根据实验结果,建议了陶粒砼Ⅰ-Ⅱ复合型断裂准则和根据K_Ⅰ/K_Ⅱ值计算起裂角θ的公式。最后,与普通砼的结果以及断裂力学中3个复合型断裂准则进行了对比。
The stress intensity factors K_I and K_II of the three-point bending beam and the four-point shear beam were calculated using a quadrilateral isoparametric element using the mixed finite element method. The critical K_I and K_II values of the ceramsite K_(IC) and I–II composite cracks were measured by using symmetrical three-point bending beams and four-point shear beam specimens. Based on the experimental results, we propose the I-II composite fracture criterion and the formula for calculating the starting angle θ based on the K_I/K_II values. Finally, it compares with the results of ordinary helium and three complex fracture criteria in fracture mechanics.