竹材物理力学性质的研究

<正>竹材的物理力学性质是竹材重要的质量指标。本文研究了竹材的公定容积重,湿胀,维管束密度、顺纹抗压强度、顺纹抗拉强度,径向和弦向的抗弯强度和一些其他性质,获知了:1.竹材分割对顺纹抗压强度的影响,2.顺纹抗压强度与竹材含水率的关系;3.竹子年龄(A)对物理力学性质的影响;4.竹秆任意高度处(H_x)的物理力学性质;5.竹材的立地等级和营林措施对竹材物理力学性质的影响;6.不同竹种的物理力学性质。

STUDIES ON PHYSICAL AND MECHANICAL PROPERTIES OF BAMBOO WOODS

China is rich in bamboo resource. Bamboo is widely used in our country as a material in house and bridge building, furniture, paper pulp, etc. Therefore, indexes of physical and mechanical properties of bamboo woods are very important. This paper deals with some properties of bamboo woods of 61 species, namely, basic volume weight, percentage of swelling, density of vascular bundle, compressive strength parallel to the grain, tensile strength parallel to the g"ain, radial and tangential bending strength and some other properties. The 9,000 samples of 311 culms experimented on were collected from 26 districts in H provinces of China from 1963 to1978This report consists of three parts: the collection and preparation of the mate rial for the experiments, methods used in the experiments, and the test results and analyses which include: l, the influence of the cross-section cuts on the compressive strength parallel to the grain; 2, the compressive strength parallel to the grain(Dw) in relation to bamboo water content (P-w), which is given in the equation: Dw = aP-Wb; 3, the effect of bamboo age (A) on the physical and mechanical properties: Pm = a + bA + cA2; 4, the physical and mechanical properties at any height (Ha) of the culm: Pm=a + bH+cHx2; 5, the physical and mechanical properties of bamboo wood influenced by the site class and silvicultural treatment of bamboo stands; and 6, the physical and mechanical properties of different bamboo species.