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Mechanical Engineering

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Bending

Poisson Effects in Beam Bending

Description

Poisson effects in beam bending describe how a material changes shape in directions perpendicular to the applied force. When a material is under uniaxial stress, it stretches or contracts along the load and also changes in the crosswise directions. Poisson's ratio, written as v, measures the ratio of transverse strain to axi...

Transcript

当材料受到单轴应力作用时,材料会在应力施加方向上发生伸长或收缩。

与此同时,在垂直于施加应力的方向上会发生形变,该形变受泊松比控制。

横向变形将导致中性面以上和以下区域发生膨胀或收缩。

垂直横向的膨胀与收缩相互抵消并消失。

对于水平横向,膨胀和收缩将导致截面的各条水平线弯曲成圆弧形。

中性表面曲率半径可表示为弯曲引起的曲率半径与材料泊松比的比值。

该曲率半径对应于由于弯曲而位于曲率半径另一侧的圆的中心。

中性表面曲率半径的倒数表示横截面的曲率,称为反向曲率。