English Views: 66 Author: Site Editor Publish Time: 2025-12-18 Origin: Site
Safety Evaluation Method of Disc Spring σOM at 50% Compression
In specialized applications of disc springs, engineers often encounter high-load scenarios where the critical point stress approaches material limits before the spring fully reaches its standard flattened position. Jiangsu Sunzo Spring will develop an engineering-based strength assessment logic and safety design methodology for this specific extreme condition, where the OM point stress reaches 1600MPa at 50% compression.
A custom-made disc spring design meets the following requirement: when the working compression reaches 50% of its initial height (h₀), the calculated stress at the O-M point (σOM) reaches approximately 1600 MPa, which is close to the allowable stress limit of typical spring steel.
At this point, you can establish the following analysis logic:
1. The state of equivalent: Under this condition, the material utilization rate of the disc spring's OM point has reached its limit, and its state can be considered equivalent to the flattened state of a conventional disc spring. Both states are essentially similar in that the stress at the critical point reaches its limit, with the only difference lying in the influence of external constraints (e.g., the flat pressure plate) on the final shape.
2. Proportional deduction: Drawing on the design experience of standard disc springs, when the stress at point OM reaches its limit under the flattened state (100% displacement), it is required that the stress at points σⅡ and σⅢ be less than the same limit value (e.g., 1600MPa) at 75% standard working displacement to ensure safety.
Based on the above logic, we can derive a strength assessment method for this specific disc spring:
The core criterion is that the calculated stress of the disc spring at σⅡ and σⅢ points is less than 1600MPa when the compression is 37.5% (50% × 75% = 37.5% h₀).
Displacement limit: At the same time, the maximum allowable working compression of the disc spring should not exceed 50% of h₀. Exceeding this displacement will cause the stress at the OM point to exceed the limit, posing a safety risk.
This criterion links the critical state of the OM point with the safe states of the σⅡ and σⅢ points through a displacement ratio (75%), forming a complete, conservative, and operationally feasible evaluation chain.
This method provides a clear idea for the design of high load and small stroke disc spring:
1. The design boundary is defined clearly: the maximum allowable displacement (50%h₀) and the secondary stress point verification displacement (37.5%h₀) are defined in the design stage, which makes the design target specific.
2. Safety margin: By controlling the stress level of σⅡ and σⅢ at lower displacement, the necessary safety margin is provided for the fatigue sensitive point. Even if the OM point is at the static strength limit, the overall design is still safe.
3. Customized development: This method can be used as an important design verification tool when the customer needs a disc spring with high stiffness, small stroke and high load capacity.
At Jiangsu Sunzo Spring, we possess the technical capability to handle disc spring systems under various complex and extreme operating conditions.
Deep analysis: For the high-strength and high-stiffness customization requirements proposed by customers, our technical team can conduct similar extreme state analysis to establish targeted safety criteria and design specifications.
Accurate simulation: We employ CAE tools to precisely calculate the stress distribution at key points under varying compression levels, validate theoretical criteria, and optimize design details.
Process Assurance: For products with high stress levels, we will focus on material selection and heat treatment processes to ensure optimal performance and reliable stability.
We are committed to combining rigorous mechanical logic with engineering expertise to address clients' unique and challenging elastic component design challenges. Whether dealing with extreme load conditions or specific performance curve requirements, we deliver safe, reliable, and thoroughly validated technical solutions.
