voluminal การใช้

Second , many mechanical properties are tested , for example , tensile strength and tensile modulus , flexural strength and flextural modulus and impact strength . by the analysis of the tensile stress - strain curves and the flexural stress - strain curves , the results are as follows : 1 ) the voluminal content of fibre of composite making by vacuum assistant resin injection is more than other composites . 2 ) the mechanical properties of the needlepunching nonwoven fabric reinforced polymer composite are superior to these of the calendering nonwoven fabric reinforced polymer composite