摘要
本文根据实验资料,用不同方法求得加重乳胶梁的前四阶动态弹性模量,加重乳胶材料的动态弹性模量随着振动阶次的提高而提高。 在振动问题中,不能以梁的实际长度与梁高之比来划分梁的类型。在低阶振动时,粱的“平截面”假定可能满足精度要求,随着振动阶次的提高其误差会迅速增大,本文讨论了梁的有效长度问题。
Based on the experiment data, the first four order dynamic moduli of elasticity for an emulsive beam with increased density are presented by using several methods. It is observed that the modulus increases with the oder of vibration.The study suggests that the type of a beam couldn't be determined according to the length-height ratio of the beam for its vibration analysis because the error of analysis will increase rapidly when the order of vibration increases. The assumption for plane cross-section could be satisfactory for the low order vibration.The discussion on the equivalent length of a beam is given.
出处
《力学学报》
EI
CSCD
北大核心
1989年第6期697-704,共8页
Chinese Journal of Theoretical and Applied Mechanics
关键词
梁
弹性模量
振动
有效长度
动力
vibration, dynamic elastic modulus, equivalent length of a beam
