Better Touch Better Business
Contact Sales at CSSSLD.
Latest products
Avoid stress concentration
by：CSSSLD
2021-02-03
Hole is force weak parts in molding processing parts, parts of the hole is stress weak positions, by around the hole to increase the thickness of the intensity of compensation, also can be regarded as a reinforcement in the use of rigid design.
Design metal insert in the parts, can increase the strength of the local or the whole plastic parts.
Honeycomb sandwich structure of rigid design the best effect, the main drawback is a relatively complex process, high costs and prices.
under dynamic loading, the stress concentration on the material of the damage is much greater than the damage caused by the static load conditions. Therefore in product design, to avoid stress concentration should be a basic guidelines. Lead to stress concentration phenomenon of stress can come from the external load, also can be inside your products for a variety of factors and formation of the internal stress. Think in terms of product design, the most direct the most effective ways to avoid stress concentration is at the edge of the corner, ling, groove contour transition and thickness junction using circular arc transition.
increase stiffness the most economical way to parts, may be the stress direction of fabrication with stiffener. It can without any increase in wall thickness under the condition of parts, makes the improve the strength and stiffness of the larger parts, therefore widely used in the design of plastic parts. Container, box type parts using reinforcement to increase rigidity is common. Will strengthen the Angle position of the reinforcement design in the container, can strengthen the strength of the corner part.
how to determine the radius of circular arc, because most of the wall similar to the classical cantilever structure, thus for different wall thickness and fillet radius to calculate the stress concentration factor, the plastic parts in the design of screw thread, paying special attention to the sharp thread line is also a serious source of stress concentration, so the thread tooth form into a circular arc form is good. In addition, whether internal thread or external thread, at the start of a screw thread part and tail part should have a certain height without the steps of the thread, and is based on the considerations.
the rounded design can not only avoid the risk of stress concentration, improving load resistance of the products, and greatly improve the liquidity of plastic melt in the mold cavity, at the same time, the transition of streamlined increased the appearance of the product visibility. Of course are not asking all the sharp corners should be rounded corners on parts, there are always exceptions, in some parts of the parts, such as parting surface, core and cavity of the mould can only use Angle. So should pay more attention to the use of these principles in product design practice, also want to consider to the specific situation.
local produce a lot of stress for the apparent stress is called the stress concentration factor. All materials have a stress concentration problem, such as gap and Angle plastic is about sensitive material, natural is affected by stress concentration. The stress concentration of injection molding processing and plastic pieces of the dangers of the most direct is to reduce the use of performance, shorten the service life of the normal. Because under stress, these areas will gradually produce microcrack, then gradually expand to larger crack, and crack extending unceasingly will cause the damage of the parts.
for possible deformation caused by external load and dead weight, warping, creep of products, enhance the rigidity of the products is given. Have rigid requirements of products, first of all to choose something from the aspects of material, the material was determined, we can through the product appearance and structure design, make the product rigidity was strengthened. Tablet of the thin shell parts, designs the surface corrugated shape, corrugated shape, spherical, parabolic, its stiffness is much higher than the same weight of the tablet.
more wonderful articles, plastic pieces of the stiffener, convex, metal insert, click directly.
http://www。 csssld。 cn//html/2017/Info_0301/509。 HTML
nantong on suye's official website: http://www. csssld。 cn//
under dynamic loading, the stress concentration on the material of the damage is much greater than the damage caused by the static load conditions. Therefore in product design, to avoid stress concentration should be a basic guidelines. Lead to stress concentration phenomenon of stress can come from the external load, also can be inside your products for a variety of factors and formation of the internal stress. Think in terms of product design, the most direct the most effective ways to avoid stress concentration is at the edge of the corner, ling, groove contour transition and thickness junction using circular arc transition.
increase stiffness the most economical way to parts, may be the stress direction of fabrication with stiffener. It can without any increase in wall thickness under the condition of parts, makes the improve the strength and stiffness of the larger parts, therefore widely used in the design of plastic parts. Container, box type parts using reinforcement to increase rigidity is common. Will strengthen the Angle position of the reinforcement design in the container, can strengthen the strength of the corner part.
how to determine the radius of circular arc, because most of the wall similar to the classical cantilever structure, thus for different wall thickness and fillet radius to calculate the stress concentration factor, the plastic parts in the design of screw thread, paying special attention to the sharp thread line is also a serious source of stress concentration, so the thread tooth form into a circular arc form is good. In addition, whether internal thread or external thread, at the start of a screw thread part and tail part should have a certain height without the steps of the thread, and is based on the considerations.
the rounded design can not only avoid the risk of stress concentration, improving load resistance of the products, and greatly improve the liquidity of plastic melt in the mold cavity, at the same time, the transition of streamlined increased the appearance of the product visibility. Of course are not asking all the sharp corners should be rounded corners on parts, there are always exceptions, in some parts of the parts, such as parting surface, core and cavity of the mould can only use Angle. So should pay more attention to the use of these principles in product design practice, also want to consider to the specific situation.
local produce a lot of stress for the apparent stress is called the stress concentration factor. All materials have a stress concentration problem, such as gap and Angle plastic is about sensitive material, natural is affected by stress concentration. The stress concentration of injection molding processing and plastic pieces of the dangers of the most direct is to reduce the use of performance, shorten the service life of the normal. Because under stress, these areas will gradually produce microcrack, then gradually expand to larger crack, and crack extending unceasingly will cause the damage of the parts.
for possible deformation caused by external load and dead weight, warping, creep of products, enhance the rigidity of the products is given. Have rigid requirements of products, first of all to choose something from the aspects of material, the material was determined, we can through the product appearance and structure design, make the product rigidity was strengthened. Tablet of the thin shell parts, designs the surface corrugated shape, corrugated shape, spherical, parabolic, its stiffness is much higher than the same weight of the tablet.
more wonderful articles, plastic pieces of the stiffener, convex, metal insert, click directly.
http://www。 csssld。 cn//html/2017/Info_0301/509。 HTML
nantong on suye's official website: http://www. csssld。 cn//
Custom message
