CAJ | 학술논문

通过单晶压痕边缘破碎实验，研究陶瓷发生边缘脆性破裂整个过程的力值变化，结果表明：压痕距边缘距离越小，压力施载速度越快，发生边缘破碎的脆性断裂力值越小。结合单晶压痕应力场数值模型和有限元仿真，分析了陶瓷材料受不同条件的外加载压力作用下的应力场分布和失效条件，其所得结论与实际结果一致。通过对压痕部位和边缘破碎部位显微形貌观察，证明边缘破碎缘于裂纹失稳扩展和贯通，并运用线弹性断裂力学理论分析了边缘破碎机理。
통과단정압흔변연파쇄실험，연구도자발생변연취성파렬정개과정적력치변화，결과표명：압흔거변연거리월소，압력시재속도월쾌，발생변연파쇄적취성단렬력치월소。결합단정압흔응력장수치모형화유한원방진，분석료도자재료수불동조건적외가재압력작용하적응력장분포화실효조건，기소득결론여실제결과일치。통과대압흔부위화변연파쇄부위현미형모관찰，증명변연파쇄연우렬문실은확전화관통，병운용선탄성단렬역학이론분석료변연파쇄궤리。
By the indentation testing with single crystal diamond,it studies the force change in the whole edge chipping process,the result shows that the maximal force which needs for brittle fracture becomes smaller when the distance between indentation from the edge is shorter,or pressure is applied more quickly.Based on the numerical model of stress field with single crystal indentation and the finite element simulation,the distribution of stress field and the failure condition are analyzed when ceramics materials endure some different external loading conditions,the obtained conclusion is consistent with the actual re-sults.The microscopic observation of micro-morphology of indentation position and the edge broken parts prove that edge chipping is due to unstable crack propagation and coalescence.The theory of elastic frac-ture mechanics is used to analyze the mechanism of edge chipping.