豚鼠肱骨中央截面应变在体测量及影响因素分析

对豚鼠左前肢肱骨中央截面进行在体应交测量。结果表明：头侧为拉应变，中点和尾侧为压应变，应变沿头尾方向的形心主轴星线性分布；截面承受偏心压缩荷载，各种步速下偏心荷载的作用点的相对位置保持不变；各点处的峰值应变和应变幅度在步速较低时，随步速的增加而增大，当步速超过一定值之后，反而下降，说明峰值应变和应变幅度皆有极限值存在。

Strain Measurement in Vivo of Cavia Porcellus Humerus Central Cross-Section and Influence Factor Analysis

This paper is concerned with strain measurement in central cross-section of cavia porcellus humerus in vivo. The strains of cramal cortex, caudal cortex and lateral midpoint are measured. The results show: the peak principal strains are tensive on the cramal surface, and compressive on the caudal surface and lateral midpoint; the strain distribution on cross-section is linear; the cross-section is subjected to eccentric axial compressive load: the relative location of load application point never changes on each step rate; the peak strains and strain amplitudes increase with increment of step rate when the step rate is lower, and decrease when the step rate overrunes a fixed value.This indicates that the peak strain and strain amplitude have limite value.