中国机械工程
中國機械工程
중국궤계공정
CHINA MECHANICAl ENGINEERING
2015年
2期
147-151
,共5页
表面粗糙度%半椭圆微缺口%应力集中系数%疲劳寿命
錶麵粗糙度%半橢圓微缺口%應力集中繫數%疲勞壽命
표면조조도%반타원미결구%응력집중계수%피로수명
surface roughness%semi-ellipse micro-notch%stress concentration factor%fatigue life
利用半椭圆微缺口表征表面粗糙度，建立了平板表面形貌的三维有限元模型，总结了微缺口参数对表面应力集中系数的影响规律。建立了表面应力集中系数与表面粗糙度之间的经验公式，预测了不同表面粗糙度下平板的疲劳寿命。研究结果表明：应力集中系数与表面粗糙度成正相关关系；当缺口数大于10时，应力集中系数随缺口数的增加而恒定；当间宽比大于5时，多缺口已经失去缓和应力集中的作用；疲劳寿命随着表面粗糙度的增加而缩短。
利用半橢圓微缺口錶徵錶麵粗糙度，建立瞭平闆錶麵形貌的三維有限元模型，總結瞭微缺口參數對錶麵應力集中繫數的影響規律。建立瞭錶麵應力集中繫數與錶麵粗糙度之間的經驗公式，預測瞭不同錶麵粗糙度下平闆的疲勞壽命。研究結果錶明：應力集中繫數與錶麵粗糙度成正相關關繫；噹缺口數大于10時，應力集中繫數隨缺口數的增加而恆定；噹間寬比大于5時，多缺口已經失去緩和應力集中的作用；疲勞壽命隨著錶麵粗糙度的增加而縮短。
이용반타원미결구표정표면조조도，건립료평판표면형모적삼유유한원모형，총결료미결구삼수대표면응력집중계수적영향규률。건립료표면응력집중계수여표면조조도지간적경험공식，예측료불동표면조조도하평판적피로수명。연구결과표명：응력집중계수여표면조조도성정상관관계；당결구수대우10시，응력집중계수수결구수적증가이항정；당간관비대우5시，다결구이경실거완화응력집중적작용；피로수명수착표면조조도적증가이축단。
According to building three dimensional finite element model of plate surface topogra-phy,whose surface roughness were represented as the semi-ellipse micro-notches,the influences of micro-notch parameters on surface stress concentration factors were summed up.Empirical equation that related surface roughness to surface stress concentration factors of plate was established and pre-dicted the fatigue life of the plate under different surface roughnesses.Research results show that:it is positive between stress concentration factor and surface roughness;when the number of notch is over 10,stress concentration factor is constant with the increase of the number of notch;when the ratio is over 5,multi-notches have been out of action to lessen the stress concentration;when surface rough-ness increases,the fatigue life decreases.
