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通过对12株成熟颤杨木性质的龄期效应的调研,确定幼龄材对材料比重、强度和硬度的影响。从每根原木的粗端锯取径向截面,以提供材料密度分布图和微弯试验试件。测定的裂断模量(MOR)和弹性模量(MOE)为颤杨的力学性质。应用分段回归分析和图析估计从幼龄材到成熟点的过渡龄期,如同所测定的力学性质反映的那样。幼龄期的持续时间约为16年。成熟点在30年龄期处,这与所调研的特征相符合。
The effects of juvenile wood on the specific gravity, strength and hardness of 12 mature poplar wood were studied through the investigation of the age effect. Radial sections were sawn from the raw end of each log to provide material density profiles and microbend test specimens. The measured modulus of rupture (MOR) and modulus of elasticity (MOE) are the mechanical properties of Chaya. Piecewise regression analysis and analysis were used to estimate the transitional ages from juvenile material to mature point, as reflected by the measured mechanical properties. The duration of young age is about 16 years. Mature point at 30 years of age, which is consistent with the characteristics of the survey.