几种开口薄壁杆在弯曲时的翘曲正应力和附加挠度

The Warped Normal Stress and Additional Deflection of Several Open Thin—Walled Bars During Plane Bending

工程上常见的Z形,园弧形等开口薄壁哉面杆在平面弯曲时,因剪切使截面翘曲而产生的正应力,当杆为细长杆时其翘曲正应力与弯曲正应力相比较小,可不计;但当杆不太长时,通过下面计算将会看到其翘曲正应力占的比重较大,应当考虑其影响。这里用材料力学的一般方法。

When the usual Z- shaped and arc—shaped Opening thin-wail bars are bent in plane,the cross-section produces warping due to shearing.When the bar is slender, the warping normal stress is small compared with bending stress and it can be ignoliged, But when the bar is shorter we will see the warping normal stress is large in the following calculation.So its effects should be considered. The calculating formulas of the warping normal stresses and the additional deflections have given using the general way of the material mechanics in this paper.