WRC-107 - Allowable Stresses

First Release: 2019.7

Consider Attachment Properties:Select the box to consider attachment properties when determining the allowable combined stress. When attachment properties are considered, the minimum of the selected yield or of the stress of the host or attachment is used to determine the allowable stress.

Allowable Basis: Select which combination of stress, yield, and their respective multipliers will be used to determine the allowable stress. The stress multiplier is shown as Cs and the yield multiplier is shown as Cy.  For local membrane this is typically Cs*S and the software defaults that way.  For combined local membrane and secondary bending, this is typically max (Cs*S, Cy*Y); but the software defaults to the min of these two values to help with low yield materials.

Stress Multiplier: The number by which stress is multiplied when determining the allowable stress.  For local membrane stress, this value is typically 1.5; but could range from 1 to 1.5.  For combined local membrane and secondary bending stress, this value is typically 3; but could range from 2 to 3.  This value defaults to 1.5 for membrane and 3 for combined.

Yield Multiplier: The number by which yield is multiplied when determining the allowable stress.  For local membrane stress, this value is typically 1; but could range from 0.67 to 1.  For combined local membrane and secondary bending stress, this value is typically 2; but could range from 1.34 to 2.  This value defaults to 1 for membrane and 2 for combined.

Only Check Combined Stress:  If this box is checked, the combined local membrane and secondary bending stresses will be checked.  If this box is not checked, then two stress checks will be performed, local membrane by itself and then the combined local membrane and secondary bending.  Designs brought forward from before the 2019.7 release will have this checked by the patching; but that can be changed by the user.