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。
Folding hinge and cap are made by stainless steel plate, the inner include standard garbage bags, a steel nets, and the other is a kind of is the plastic garbage bags can rotate.
折叠式的铰链和盖子都是由不锈钢板制作的，内层包含标准的垃圾袋，一种是钢板网，另一种是可旋转的塑料垃圾袋。
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