Accession Number:

ADA056372

Title:

Flaw Growth in Complex Structure. Volume 1. Technical Discussion

Descriptive Note:

Final rept. 12 May 1975-12 Sep 1977

Corporate Author:

LOCKHEED-CALIFORNIA CO BURBANK

Personal Author(s):

• Brussat, T. R.
• Chiu, S. T.
• Creager, M.

Report Date:

1977-12-01

Pagination or Media Count:

307.0

Abstract:

Fatigue crack growth testing and analysis were conducted to evaluate the effects of initial flaw location and multiplicity on fatigue crack growth life and element failure sequence in multiple element, mechanically fastened metallic structure. The test program, which included 68 precracked structural specimens consisting of 26 joints and 42 stringer-reinforced panels, is described in detail. Stress intensity factor analyses and stress severity factor equations and the results of baseline static, fatigue, crack growth, and fracture tests are presented for use in making crack growth predictions for the structural specimens. Procedures are described for machining, precracking, assembling and testing the structural specimens. The test results and corresponding analytical results are presented and compared.

Descriptors:

• *CRACK PROPAGATION
• *AIRFRAMES
• *JOINTS
• *FASTENINGS
• MILITARY REQUIREMENTS
• EXPERIMENTAL DESIGN
• FLIGHT SIMULATION
• STRUCTURAL ENGINEERING
• STRESS CONCENTRATION
• REINFORCEMENT(STRUCTURES)
• FATIGUE TESTS(MECHANICS)
• STATIC TESTS
• TOLERANCES(MECHANICS)
• MATHEMATICAL PREDICTION
• DEFECTS(MATERIALS)
• FRACTURE(MECHANICS)

Subject Categories:

• Aircraft
• Couplers, Fasteners and Joints
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE