Abstract

In this study, we investigated the macro and micro mechanisms of bamboo bending failure, and a new method to unfasten bamboo fiber by continuous bends and large deformations is put forward. The method could effectively maintain the fiber structure integrity without damage. Bamboo strip with load deformation was considered a continuous beam, and the bending moment and the matrix cracking of the bamboo were analyzed on the basis of elastically plastic theory. The mechanical model to unfasten the bamboo fiber under continuous bending was established using the principle of virtual work, while the loading conditions were obtained. The arithmetic expressions for the loading roller diameter and distance, as the main parameters, were obtained analyzing bamboo splitting under different strain conditions. The fiber splitting test further verifies our method and models, which provide a new idea and way for bamboo fiber splitting by mechanical method.

摘要

在这项研究中，我们研究了竹子弯曲破坏的宏观和微观机制，并提出了一种通过连续弯曲和大变形来松开竹纤维的新方法。该方法可以有效地保持纤维结构的完整性而不受损伤。将荷载变形的竹条视为连续梁，根据弹塑性理论分析竹材的弯矩和基体开裂。利用虚功原理建立了竹纤维在连续弯曲下的松解力学模型，并得到了载荷条件。以加载辊直径和距离为主要参数，得到不同应变条件下竹子劈裂分析的算术表达式。