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Digitale Medien

Effect of Through-Thickness Stitching on the Fatigue Life of Composite Single-Lap Joints (1998)

Jain, Lalit K. ; Leong, K. H. ; Mai, Yiu-Wing ; [weitere]

Springer

Applied composite materials 5 (1998), S. 399-409

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Details

ISSN: 1573-4897

Schlagwort(e): single lap joints ; resin transfer moulding ; through-thickness stitching ; fatigue life ; strength ; cycles to failure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract An exploratory experimental evaluation has been undertaken to investigate the effect of through-thickness stitching on the fatigue life of composite single lap joints. Balanced single lap joints were considered, and the lay-up for the adherends was (0/±45/90)s Specimens were stitched transversely and through-the-thickness with Kevlar® thread in a zigzag pattern and were manufactured using the resin transfer moulding (RTM) technique. Preliminary experimental results have indicated that stitches remain intact when the crack starts growing from either side of the overlap. This consequently imparts a significant improvement in the fatigue life of stitched versus unstitched counterparts.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1008837509977

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Digitale Medien

New variational formulations for minimal surfaces (1992)

Tabarrok, B. ; Tong, Liyong

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 35 (1992), S. 491-502

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Details

ISSN: 0029-5981

Schlagwort(e): Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: Using curvilinear co-ordinates of the surface, a functional is developed for the classical formulation for minimum surfaces and is then utilized to obtain a complementary formulation. Unlike the classical formulation in Cartesian co-ordinates, these two formulations are applicable to multi-valued surfaces and give upper and lower bounds to the exact solution when used in an approximate analysis, e.g. finite elements. By means of Lagrange multipliers, a constraint on enclosed volume is incorporated into the basic functional.

Zusätzliches Material: 5 Ill.