频率变化对连杆动态应力的影响研究

通过试验研究验证了连杆有限元仿真模型的精确性,进一步研究了加载频率变化对连杆动态应力的影响,得到了加载频率变化对连杆动态应力的影响规律.结果表明:在加载频率较低时,连杆动态应力会随着加载频率的增加而增大,但总体来说应力值增加不大,可以忽略;在加载频率较高时,加载频率对连杆动态应力的影响很大,不可忽略.     

MEDIAL EPICONDYLE FRACTURE OF THE HUMERUS WITH ULNAR NERVE PALSY OF AN 11-MONTH-OLD INFANT:CASE REPORT

To our knowledge,there is no report concerning medial epicondyle fracture of the humerus for infants,the clinical course and treatment outcome of an 11 -month-old boy with such fracture with ulnar nerve palsy was described in this article.Ulnar nerve detection and scar tissue release were performed.The bony fragment was anatomically reduced and fixed with an anchor.The above-elbow wellpadded anterior plastic splint was used postoperatively for 4 weeks.After removing the splint,the motion of hand had no obvious improvement accompanied with claw hand deformity,and nerve transplantation was suggested to the patient’s parent.We would like to remind clinicians of encountering the clinical manifestations to be vigilant for any possibilities.     

微动磨损对发动机机体可靠性的影响及研究

采用有限元计算和断口分析等多种手段对机体与轴承盖之间的微动进行分析,从微观角度揭示微动磨损对机体可靠性的影响,并针对性地提出改进方法。     

曲轴平衡重螺栓仿真分析与试验研究

结合有限元分析软件,在考虑螺纹的基础上,建立了曲轴平衡重螺栓三维模型,并采用接触分析法对螺栓的应力应变进行了三维有限元计算.同时,通过对曲轴平衡重高强度螺栓力矩法和转角法的拧紧方式进行的对比试验,了解了螺栓不同拧紧方式对螺栓轴向力的影响,测得了螺栓杆部危险截面处应力值的大小,仿真结果与试验结果比较后表明,其吻合程度良好...