Influence of cold compression molding process and extraction location on the mechanical properties of structural bamboo scrimber
In order to compare the strength levels of bamboo scrimber by "hot pressing" and "cold press-ing-thermal curing", and to investigate the effect of "cold pressing-thermal curing" on the surface and core layers of reconstituted bamboo square lumber, as well as to provide a basis for experimental analysis to enrich the appli-cation scenarios of secondary processing of square lumber into panels and to improve the stability of mechanical properties, mechanical property tests were designed and carried out for two processes of bamboo scrimber. The test used 7 indices and 420 specimens, including modulus of elasticity, longitudinal flexural strength, longitudinal tensile strength, longitudinal compressive strength, longitudinal shear strength, full and local compressive behav-ior perpendicular to the grain. The results showed that, except for modulus of elasticity and longitudinal tensile strength, the mechanical properties of hot-pressed bamboo scrimber were significantly better than that of cold-pressed bamboo scrimber, and the strength class of hot-pressed and cold-pressed bamboo scrimber reached 10E-90f. There were highly significant differences in the mechanical properties of the surface and core materials of the cold-pressed bamboo scrimber, such as longitudinal tensile strength, longitudinal compressive strength and compressive perpendicular to the grain. The longitudinal compressive strength and compressive perpendidular to the gain of the lower surface material were lower than those of the material located in the upper surface and core region, while the longitudinal tensile strength was higher than the last two. The ultimate longitudinal compressive strength of cold-pressed bamboo scrimber had the largest variation in the thickness direction, which was deter-mined as 20.9％, and the variation coefficient of longitudinal tensile strength was 10.61％. The variation in the mechanical properties of cold-pressed bamboo scrimber squares in the thickness direction was inferred to be due to uneven adhesive distribution, curing delamination and uneven heating of the slabs.
万方数据
维普
