Influences of Hot Pressing Process Parameters on the High-temperature Tensile Properties of Hemp Fiber Boards
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.
万方数据
维普
