How to calculate the allowable tensile force and breaking tensile force of stainless steel wire ropes

When stainless steel wire ropes are used as key load-bearing components, to ensure lifting safety, it is necessary to calculate their allowable tensile force and breaking tensile force to ensure that the load-bearing tensile force is within the allowable range. So, how should we calculate these two parameters? The New Century has summarized the following two formulas for everyone.

Stainless steel wire

The ratio of the breaking tensile force to the allowable tensile force is called the safety factor, denoted by K. In the formula, K represents the safety factor of the steel wire rope; Sb - Breaking force of the steel wire rope (kN); P - Allowable tensile force of the steel wire rope (kN).

The K value varies depending on the application of the steel wire rope. Generally, the K value of the steel wire rope used in cranes is 5.5, and that of manual lifting equipment (such as chain hoists, etc.) is 4.5. The breaking force of steel wire ropes is rather complicated to calculate. The state has implemented standardized management for the specifications and tensile strength of steel wire ropes, so the following empirical formula can be used for estimation:

The allowable tensile force of stainless steel wire rope refers to the force that the wire rope is allowed to withstand under the condition of ensuring the safety of lifting. To ensure the safety and reliability of hoisting, New Century also reminds the operators that the steel wire rope must not reach the breaking point. Therefore, the breaking force should be several times greater than the allowable force to guarantee its complete reliability.