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các chống nứt is a peculiar fracture process that is believed to occur in dry snow slab avalanches. Interestingly, it has also been reported in superheated ice, deep earthquakes, and submarine landslides.
Trong nghiên cứu này, we evaluated the performance of a new elastoplasticity model for porous materials, which reproduces the onset of chống nứts in a snow fracture experiment. A modified strain-softening plastic flow rule is used to capture the complexity of porous materials under mixed-mode loading. The key to the model’s performance is its ability to emulate the onset of the chống nứt.
We examined the chống nứt‘s performance in two experiments. Each lasted two hours and consisted of three test phases. Đầu tiên, we poured concrete to a designated location below the structural main reinforcement. Kế tiếp, we fixed the rebar mesh at the design position. After this, we performed a series of tests. Cuối cùng, we measured the vertical displacement of markers placed at various points on the slab. The results show that a number of interesting features occurred during the testing process.
In the two cited tests, cái chống nứt‘s most notable feat was a reversible fracture that started at the crown of the avalanche, traveled down the weak layer, and then branched outwards. This is the first time that this particular feat has been documented in a laboratory setting.
Tất nhiên rồi, this feat has been surpassed by many other achievements in this study. Hơn thế nữa, the most interesting is a new elastoplasticity modeling strategy for porous materials that successfully mimics the onset of chống nứtS.