25
2022
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10
Profile bending wrinkle is what's going on?
Author:
Qingdao Yuanhao
Profile bendingIt is very common in construction technology. Profile drawing and bending aluminum is suitable for a variety of profiles. The width-thickness ratio of rectangular cross-sectional profile is the main factor affecting the generation of wrinkles, and it is also the reason for the material properties to produce wrinkles.
Now many people have discovered and studied the relationship between the rectangular cross-sectional profile and the folding of the rectangular plate. Different types of profiles, different materials and many different cross-sections will form the difference between wrinkles. Rectangular surface materials also have wrinkling behavior during stretching and bending, and corresponding research has been carried out. When the profile is stretched and bent, pure bending also has wrinkling behavior, which is different in many aspects. Based on plastic deformation theory and energy Method, a theoretical analysis model of pure bending deformation wrinkling and section deformation is established.
In the process of profile bending, the part under the neutral layer that bears the longitudinal pressure, as well as the radial direction and its width direction, is also subjected to compressive stress. Under the action of the three-sided compressive stress of the profile, longitudinal contraction and radial increase will occur, and severe deformation will lead to serious wrinkling behavior. There are also folds on the inside of the profile, and there is pressure at both ends of the thin-walled shell. This is related to the pressure, as well as the thickness and width. The smaller the ratio between them, the smaller the ratio, the higher the possibility of wrinkles and instability. This increases the thickness of the inner mesh of the profile and improves its wrinkle resistance. When the cross-sectional shape is relatively stable, the tensile bending increases the tension, it can effectively prevent the occurrence of wrinkles. The engineering design of profile stretch bending is not a simple process and requires skilled technology.
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