If this load centroid is behind the elastic axis of the wing structure, then a nose-down twist of the main wing surface results.
如果该载荷重心在机翼结构弹性轴之后，则引起主机翼表面前端向下的扭转。
The results indicate that the elastic operating stress range of a torsional axis is extended greatly by pre-twist process and the main reason lies on surface residual stress.
结果表明，预扭后扭力轴弹性工作应力范围得到极大扩展，其主要原因在于预扭塑变形成的表面残馀应力。
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