CAJ | 학술논문

丁腈橡胶为石化行业应用最为广泛的一类橡胶材料。在受到周期应力的作用下，丁腈橡胶内已存在的裂纹会不断扩展而最终导致橡胶断裂。本文考察了预制缺陷的种类及大小对丁腈橡胶疲劳过程中裂纹扩展情况的影响，并对断面形貌进行了观察。结果表明，在圆形、纵向和横向三种缺陷中，纵向缺陷对丁腈橡胶的力学性能和耐疲劳性能影响最小；对圆形缺陷来讲，随孔直径的增大，丁腈橡胶的耐疲劳性能和力学性能逐渐下降。
정정상효위석화행업응용최위엄범적일류상효재료。재수도주기응력적작용하，정정상효내이존재적렬문회불단확전이최종도치상효단렬。본문고찰료예제결함적충류급대소대정정상효피로과정중렬문확전정황적영향，병대단면형모진행료관찰。결과표명，재원형、종향화횡향삼충결함중，종향결함대정정상효적역학성능화내피로성능영향최소；대원형결함래강，수공직경적증대，정정상효적내피로성능화역학성능축점하강。
NBR products are widely used in petrochemical industry. Under conduction of cyclic stress,the cracks in rubber will continue to develop until rubber breaks. In this paper,the effect of kinds and diameter of flaws on crack development of NBR rubber was investigated and the fraction surfaces were observed using SEM. The results show that parallel cracks have the littlest effect on mechanical properties and fatigue property of NBR rubber in par-allel,cross and round crack and that both mechanical properties and fatigue property of NBR rubber become poorer with increase of diameter of round flaws.