Section shape analysis

The maximum bending moment that can be assumed is proportional to the bending section coefficient W, and the larger W is, the more favorable it is. On the other hand, the amount of material used depends on the cross-sectional area A. The ratio of W to A can be used to judge the rationality of the shape of the two sections. A larger ratio indicates that the section is more reasonable. It can be seen from Table 2 that among these three types of wood-plastic floor cross-sectional shapes, the hollow structure is the most reasonable; the open structure has a circular opening with a radius of 11 mm in the lower half of the plate, which increases the position of the central axis, resulting in yc becoming larger , The bending section coefficient becomes smaller. At the same time, from the perspective of three-point bending stress analysis of wood-plastic flooring, the farther away from the central axis, the greater the normal stress. Through analysis, we know that when subjected to bending force, the wood-plastic floor with an open structure at the bottom bears a large tensile stress.

Three kinds of cross-section wood-plastic floors have different applications. Open-structure wood-plastic floor has a thick upper surface, which is wear-resistant and impact-resistant. At the same time, because of the semi-circular groove on the lower surface, it can guide the water accumulated on the ground. , But the upper surface is relatively thin and easily damaged when impacted; at the same time, due to the arrangement of four 23mmX15mm rectangular hollow structures in the middle, it is easy to store water. When the temperature is high, the water vapor generated inside will easily cause damage to the wood-plastic floor ; Solid structure wood-plastic floor has relatively high wear resistance and impact resistance, but the raw material consumption is more. Therefore, in use, according to the actual situation, select the appropriate section of wood-plastic floor.

in conclusion

1) Calculate the cross-sectional shape of the open-type WPC floor, ignoring the grooves on both sides; when calculating the cross-sectional shape of the hollow and solid wood-plastic floor, you can ignore the grooves on both sides and the triangular groove on the lower surface.

2) In theory, the cross-sectional structure of the hollow wood-plastic floor is the most reasonable. However, in actual use, the choice needs to be considered in conjunction with the specific situation.

3) The approximate formula for the calculation of the cross-sectional shape of the open type, hollow type and solid type can simplify the calculation formula in practical applications.

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