The fixed end behaves as a plastic hinge, and the plastic region near the point where the concentrated load acts is developing, while that near the fixed end unloading.
固支端保持为塑性铰，集中荷载作用点附近塑性区扩展而固支端附近塑性区卸载阶段。
The bold black lines absorb more energy than the rest of the material, causing the plastic to contract — creating a hinge that folds the sheets into 3-d shapes.
板子上的黑色粗线条会比其他部分吸收更多的热量，这样塑料板就会紧缩——产生折痕，继而轻松折叠成三维模型。
In order to improve the inadequacy of the current strut model, a more reasonable model is applied based on the mid-strut plastic hinge theory.
针对目前杆件力学模型存在的不足，基于杆中部塑性铰模型的思想提出了一个更加合理的力学模型。
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