The strength of rivets is affected by a number of factors, which together determine the bearing capacity and reliability of rivets in practical applications. Here are some factors closely related to rivet strength:
1. Diameter and number of rivets
Under certain conditions, the larger the diameter of the rivet, the larger the section area, so the greater the load it can withstand, and the strength is correspondingly improved.
Similarly, the greater the number of rivets, the smaller the load spread over multiple rivets, and the smaller the stress on each rivet, thereby improving the overall riveting strength.
2. Length of rivets and total thickness of riveted parts
The length of the rivets and the total thickness of the riveted parts have a direct effect on the riveting strength. In general, the longer the rivet length, the thicker the total thickness of the riveted parts, the lower the riveting strength. This is because long rivets are more likely to bend and deform during the riveting process, thus affecting the riveting quality.
At the same time, the total thickness of the riveted parts is too thick, which will increase the difficulty of rivet penetration and the risk of stress concentration, and reduce the riveting strength.
3. Size and number of rivet holes
The size and number of rivet holes directly affect the strength of the riveted parts. Opening the rivet hole too large or too much will weaken the strength of the riveted part, because the presence of the hole is equivalent to introducing a stress concentration point on the riveted part.
Therefore, when designing the riveting structure, it is necessary to reasonably control the size and number of rivet holes to ensure the riveting strength.
4. Rivet material and manufacturing process
The material of the rivet has a direct effect on its strength. Rivets of different materials have different mechanical properties, such as steel rivets with higher strength and hardness, and aluminum rivets have the characteristics of light weight and corrosion resistance.
In addition, the manufacturing process of the rivet will also affect its strength. For example, heat treatment, cold hardening and other processes can improve the strength and hardness of the rivets, thereby improving the riveting strength.
5. Riveted form
The form of riveting is also one of the important factors affecting the strength of rivet. For example, when docking, the double cover structure usually has higher strength than the single cover structure, because the double cover can provide better support and disperse the role of stress.
6. Grade division of rivets
According to the requirements of the international standard ISO898-1, rivets are usually divided into different grades, such as 4.8, 8.8, 10.9 and 12.9. These grades represent the strength grade and application range of the rivets. For example, Class 12.9 rivets are suitable for connections under specially required heavy loads and dynamic or vibrating load conditions.
In summary, the strength of rivets is affected by many factors, including the diameter and number of rivets, the length of rivets and the total thickness of rivets, the size and number of rivet holes, the material and manufacturing process of rivets, the form of rivets and the grade division of rivets. When designing and selecting rivets, these factors need to be considered comprehensively to ensure the strength and reliability of the riveted structure.
