Results of unaxial and biaxial tests on riveted fuselage lapjoints specimens

In the USA uniaxial fatigue tests were carried out for the FAA on riveted lap joint specimens to study the effect of various lap joint parameters on fatigue life and the occurrence of MSD. These test were carried out by Arthur D. Little Co. (ADL) and the Fatigue Technical Institute (FTI). The parameters considered and their levels selected for...

Statische en damage tolerance beproeving van Fokker 100 Stabilo

Lezing gehouden op het NVvl-VSV Symposium "Certificatie van Vliegtuigen" op 29 april 1988, bij de faculteit der Luchtvaart- en Ruimtevaarttechniek van de Technische Universiteit Delft

Damage tolerance of stiffened-skin structures: prediction and experimental verification

Some consequences of application of the current damage tolerance airworthiness requirements for transport aircraft in designing stiffened-skin structures to be safe under all operational load conditions are discussed. Compliance with these requirements may be shown by analysis supported by test evidence. To provide the designer with analytical...

Residual strength of bonded stiffened panels: prediction and experimental verification

This report presents results of residual strength calculations, carried out on cracked panel configurations of various designs and provided with bonded stiffeners. The calculations were carried out using the computer program BOND. The results of these calculations are compared with results of residual strength tests, performed on panels of...

Application of fracture mechanics to built-up structures

Application of fracture mechanics in designing built-up sheet structures

Past experience has shown that during the operational life of an aircraft structure cracks or failures may arise in different structural components. In future designs the designer must be able on the one hand to restrict the occurrence of cracks by a careful detail design and on the other hand to guarantee some specified life of the aircraft if...

Residual strength data of riveted panels with different stiffener configurations

Residual strength tests were carried out on center-cracked panels with a 2024-T3 or 7075-T6 skin and provided with eccentric stiffeners of practical design. The stiffeners were riveted to the skin. The material of the stiffeners was 7075-T6. In some cases the stiffeners were combined with Ti-alloy crack stoppers. On the basis of the test results...

User's manual of ARREST, a computer routine for prediction of residual strength of cracked stiffened panels

This report gives a detailed description of the computer program ARREST and of the execution of it in determining the residual strength diagram of cracked stiffened panels. The essentials of the computer program are dealt with in chapters 1 through 5, whereas the derivation of the equations together with the program flow charts ajid the program...

Fail-safe characteristics of built-up sheet structures

The thickness effect in plane stress fracture toughness

Residual strength tests were carried out on center cracked aluminium alloy panels of various thicknesses. Slow crack growth, crack opening displacements and compliances were recorded. In addition to the test data, the report presents discussions on the residual strength "behaviour, the thickness effect, R-curves and COD and compliance measurements

Residual strength of cracked stiffened panels

In this report a method for the prediction of the residual strength of cracked stiffened panels, presented in an earlier NLR publication, is further evaluated. The method takes full account of sheet-stringer interaction in the cracked region and sets a criterion for unstable crack growth arrest. Ultimate panel failure is then initiated either by...

The static strength of aluminium alloy sheet specimens containing one or more transverse rows of circular holes

Static tests were carried out on aluminium alloy sheet specimens with one or more rows of circular holes ajid a rectangular or a staggered hole pattern to investigate the effect of the circular holes on the static tensile strength. The static efficiency is defined as the ratio of the net section fracture stress of the notched specimen and the...

Residual strength of cracked stiffened panels

A brief review is given of the literature dealing with the effect of a stiff ener on the stress distribution in a cracked sheet, Exipting theories for the prediction of the residual static strength of cracked stiffened panels are analyzed. A new approach to this problem is developed, using the residual strength characteristics of the unstiffened...