【摘要】 为评估麻纤维板的整体性能和质量，并解决麻纤维板热压加工中出现的成形缺陷等问题，本文通过麻纤维板高温拉伸试验，研究温度和拉伸速率相关热压工艺参数对麻纤维板拉伸性能影响规律，并通过扫描电子显微镜分析其拉伸、断裂破坏特性。结果表明，麻纤维板的应力—应变曲线可以分为4个阶段，分别为弹性变形阶段、塑性变形阶段、树脂破坏阶段和纤维破坏阶段。拉伸速率越大，麻纤维板最大应力越大，拉伸速率对材料的弹性模量和和最大应变影响较小。生产中可减小热压速率来减少能耗。温度越高，麻纤维板最大应力、弹性模量越小而最大应力时的应变越大，实际生产中可适当提高麻纤维板温度来预防热压缺陷的产生。实验得到了麻纤维板高温拉伸特性及断裂破坏特性，对麻纤维板的实际生产和加工缺陷的预防有一定的指导意义。更多还原

【Abstract】 To evaluate the overall performances and quality of hemp fiber boards and address the issues such as forming defects that occur during the hot pressing process of hemp fiber boards, the influences of temperature, tensile rate, and other related hot pressing process parameters on the tensile properties of hemp fiber boards were studied via the high-temperature tensile tests, and the tensile and fracture failure characteristics were analyzed via scanning electron microscopy.The results show that the stress-strain curves of hemp fiber boards could be divided into four stages, including elastic deformation stage, plastic deformation stage, resin failure stage, and fiber failure stage.The higher the tensile rate, the greater the maximum stress of hemp fiber boards, the less the influences on the strain and elastic modulus of the material subjected to the maximum stress.In the productions, the hot pressing rate could be reduced to reduce energy consumption.The higher the temperature, the smaller the maximum stress and elastic modulus of the hemp fiber boards, and the larger the strain at the maximum stress.In the practical productions, the temperature of the hemp fiber boards could be appropriately increased to prevent the occurrence of hot pressing defects.The high-temperature tensile characteristics and fracture failure mechanisms of hemp fiber boards were obtained via experiments, providing certain guiding significances for the actual productions and preventions of processing defects of hemp fiber boards.更多还原