期刊论文

Effect of holes on the bending strengthof larchlumber

中文

中南林业科技大学学报

1673-923X

2021

41

7

150-155+164

10.14067/j.cnki.1673-923x.2021.07.018

国家林业公益性行业科研重大专项（201304504）； 湖南省高校创新平台开放基金项目（19K110,14K113）；

本校为第一机构

【目的】研究孔的位置和直径对落叶松板材抗弯性能的影响规律。【方法】以兴安落叶松无缺陷木材为研究对象,首先采用抗弯试验方法测试一批试件的弹性模量与静曲强度,建立其静曲强度与弹性模量的数学模型;接着对其他试件采用同样的方法（荷载只加到破坏荷载的约3/7）测试其弹性模量,利用前述数学模型推算其静曲强度;然后对其进行钻孔,并测定各试件钻孔后的静曲强度和弹性模量;比较各试件钻孔前后的静曲强度和弹性模量值,求取孔所引起的静曲强度削弱率和弹性模量削弱率,分析孔对试件抗弯性能的影响规律。【结果】孔与试件下表面或上表面相切,孔径与厚度之比为0.2时,板材静曲强度削弱率（平均值）达...

【Objective】The purpose of this work is to study the effect law of hole location and diameter on the bending properties of larch plates.【Method】Taking non-defective larch plates as the research object, the MOE and the MOR of a batch of test pieces were firstly tested by bending test method, and established their mathematical model. The same method (load is only added to about 3/7 of the breaking load) to test the MOE, and the mathematical model is used to calculate the MOR; then the test piece is drilled, and determine the MOR and the MOE af...