DI-SESS-82264

Pod Fatigue and Damage Tolerance Methodology Report

Specifies the engineering assumptions and analysis methodologies used to substantiate the pod's design with respect to fatigue and damage tolerance, feeding the Stress, Fatigue, and Fracture Analysis Report.

Approval DateMay 16, 2019

AMSC NumberN10029

Preparing ActivityAS

Project NumberSESS-2019-017

OPR—

DTIC Applicable—

GIDEP Applicable—

Limitation—

Applicable Forms—

Approval Limitation—

Form Version—

DID Formatfree_text

963C CompliantYes

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

Supersedes

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Description & Purpose

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Application & Interrelationship

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Use & Relationship

The Pod Fatigue and Damage Tolerance Methodology Report specifies the fundamental engineering assumptions and analysis methodologies that will be used to substantiate the pod's design with respect to fatigue and damage tolerance. The data will be used to develop the Stress, Fatigue, and Fracture Analysis Report.

This Data Item Description (DID) contains the format and content for data resulting from the work tasks described by the contract statement of work.

Preparation Instructions

1Reference documentsNone.

2FormatContractor format acceptable.

3ContentThe Pod Fatigue and Damage Tolerance Methodology Report shall contain the following:

3.1Describe the methodology used to perform fatigue and damage tolerance analyses of the pod structureincluding joints, fasteners, and fittings.

3.2Describe the fatigue life and damage tolerance criteria for the pod

3.3Describe the spectrum generation processand the method by which the repeated loads defined by the master event spectrum will be filtered and utilized in the fatigue and damage tolerance analyses.

3.4Describe the methodology to be used to determine or develop fatigue allowablesand the criteria for using strain-life or stress-life crack initiation curves, and crack growth rate curves.

3.5Describe any design policies or guidelines used in lieu of detailed fatigue analysessuch as fastener de-rating policies used in lieu of detailed fastener fatigue analysis, or any proposed allowable stress cut-off levels that are used in lieu of structure detail fatigue analysis.

3.6Describe the methodology to be used to account for stress concentrations due to geometry effectsDescribe hole geometry effects, loaded fastener hole effects, hole filling effects, fastener and hole fit effects, complex loading and combined stress concentration effects, notches effects, fillet effects, multiaxial stress states, shallow stress gradient effects, shim and gap effects, and any other geometry effect in the designed pod structure that differs from a simple geometry stress concentration found in published and approved handbooks or proprietary vendor test data.

3.7Describe the methodology used to account for material, processing, and environmental effectsin the fatigue and damage tolerance analyses including fatigue life enhancement processes or methods.

3.8Describe any planned deviations from standard aerospace industry accepted fatigue and damage tolerance analysis practicesDescribe the method to verify the fatigue and damage tolerance analyses for the pod.

References

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