目的 科学评价定向刨花板的力学性能。方法 基于GB/T 17657—2013使用三点弯曲方法，在5种加载速度条件下检测定向刨花板试件的力学性能，并使用数字散斑应变测量分析系统（DIC）同步记录试样面内应变分布。结果 基于研究选取的加载速度，发现加载速度的增加虽可在一定程度上提高弹性模量和最大载荷测量值，但影响并不明显。定向刨花板固有力学性能的变异性明显大于加载速度对力学性能的影响。结论 当加载时间大于或小于国标规定的时间（60±30）s时，最大载荷条件下试样的最大位移变异性增加。定向刨花板试样内的应变分布并不完全符合经典的梁弯曲理论和层合板理论。

The work aims to scientifically evaluate the mechanical properties of oriented strand board (OSB). The mechanical properties of OSB specimens were measured under five loading speeds in the three point bending method based on GB/T 17657—2013. The in-plane strain distribution of the specimens was recorded with digital image correlation (DIC) synchronously. The results showed that, based on the loading speed selected in the study, it was found that, although the increase of the loading speed could improve the elasticity modulus and the maximum load measurement value to a certain extent, the effect was not obvious. The variation of intrinsic mechanical properties of OSB was obviously greater than the effect of loading speed on mechanical properties. The variation of the maximum displacement of the sample increases under the maximum loading force when loading time is larger or smaller than (60±30) s given in the national standard. The strain distribution in OSB sample is not completely in consistency with the well-known beam bending theory and laminated panel theory.