﻿ HDPE双壁波纹管有什么特性呢？ 新闻动态

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# HDPE双壁波纹管有什么特性呢？

HDPE双壁波纹管波纹管弹性特性的非线性取决于它的几何形状和位移量。通常，这种非线性是不大的。在计算作为A离器、补偿和弹性接头的波纹管时可以不必考虑非线性问题。如果波纹管作为弹性元件和弹簧一起工作，并且波纹管的刚度比弹簧的刚度小，那么这种测量部件的非线性便主要取决于弹赞的特性。
The nonlinearity of the elastic properties of HDPE Double wall bellows depends on its geometry and displacement. Generally, this nonlinearity is not large. In the calculation of bellows as a separator, compensation and elastic joint, it is unnecessary to consider the nonlinear problem. If the bellows works together with the spring as an elastic element, and the rigidity of the bellows is smaller than that of the spring, then the nonlinearity of the measuring part mainly depends on the characteristics of the spring.

When the bellows is used as a measuring element to directly convert the pressure into displacement, the nonlinear characteristic must be considered in the calculation.

The experimental characteristics of bellows for force Q or pressure P are obviously different from the linear characteristics even when the displacement is in the central area of the section. Therefore, strictly speaking, the linear characteristics (experimental or calculated) are only in the initial state (at P-0) of the elastic element, and the performance of the elastic element will have some errors compared with the linear characteristics under load. In the bellows used in the instrument manufacturing industry, the mutual displacement of the half wave extreme section may exceed the wall thickness in order of magnitude. In these cases, the nonlinear characteristics will become an important problem. Under the action of pressure P and force o, some experimental data about the nonlinear characteristics of the bronze bellows are listed in the table. The load causing bellows elongation is taken as positive value.

The mechanism of the above performance of bellows under load in linear region has been explained by feodochev. This interpretation is based on the analysis of the radial displacement at different points of the corrugated profile and the corresponding circumferential membrane stress. In fact, it is applicable to the bellows under any displacement.

At the extension of the bellows, the points of the inner and outer ring shells displace each other in the opposite direction, so that the circumferential forces of compression and tension appear correspondingly at these points.

If the corrugation is pre compressed, when the bellows are under tension, the ring cone part of the corrugation will twist, and the edge of the ring cone will produce radial displacement, which is opposite to the displacement sign of the ring shell part. Because of these reasons, the total circumferential force and stiffness become smaller when the displacement of bellows is the same. This point can be illustrated by the characteristic curves of - 0.125 and - 0.25 shown in Fig. 3. Therefore, when other parameters are the same, there is an optimal coefficient value x = x, and the initial stiffness is the smallest. 微信扫一扫