周辺を単純支持した合板の圧縮座屈について
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The first discussion of the buckling of plywood appears to have been made by Balabuch. March has also dealt with the problem both theoretically and experimentally. There have been many writers besides them who have contributed to finding methods in various ways for the buckling of plywood plates. In many cases, the strain energy method has to be used. One of the few cases where an exact and simple solution is known is that of a simply supported 0° or 90° plate under unidirectional compression (P_2=0, S=0 in Fig. 1). In this case, equation (4) reduces to the known accurate result (5). On the other hand, Norris has pointed out that the stress p_<cr> at which the buckling first occurs can be written as equation (7) and the buckling stress coefficient k_c is given in equation (8), where r is chosen to make p_<cr> the minimun. Previous experimental discussions have been limited to specific construction of plywood of equal veneer thickness. In this report, plates of Lauan Plywood of various construtions as shown in Table I have been tested, and the observed values of k_c have been compared with the calculated values. The values of k_c is plotted against a/b(E_2/E_1)^<1/4>. Examples of these curves are shown in Fig. 3 (a)-(g). When a/b(E_2/E_1)^<1/4> is greater than 1, the value of k_c is approximately independent of a/b, and k_<c(a/b→∞)> which is defined as equation (10) which is arranged to (11) including Q(=E_L/E_T), A and D, where A and D depend on the construction of plywood. The effect of A and D on k_<c(a/b→∞)> is shown in Table III, when Q is equal to 20. E_1 is Young's modulus of plywood parallel to the direction of compression (Parallel to the side a in Fig. 1), E_2 is Young's modulus of plywood perpendicular to direction of compression (Parallel to the side b), E_L is the longitudinal Young's modulus of the solid wood composing the plywood, E_T is the tangential Young's modulus, and A is determined in formula (c), D is determined in (g), where t_n are shown in Fig. 4.
- 社団法人日本材料学会の論文
- 1971-11-15
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