With material mechanics theory, expounded bolt tail subjected to no center load action and roof bolt broken mechanism while roadway was supported with bolts.
应用材料力学理论，阐明了锚杆支护时锚尾一定受到偏心载荷作用和顶板锚杆破断的机理。
No glue required: Broken polymer chains reform to repair a crack in this material when it is pressed together and exposed to UV light.
图注：无需胶水。在紫外光下，两节断开的材料通过挤压将断面粘合。
After 4 cycles, the Pbbased alloy grid is broken whereas the composite ti expand grid is in good condition and has no obvious corrosion except the little shedding of active material.
寿命经过4个大循环单元后，铅基合金腐蚀断裂，而复合钛拉网板栅仍然完好，没有明显腐蚀，只是活性物质有些脱落。
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