By Martin Knops
This publication offers for the 1st time comprehensively the idea of Alfred Puck on failure in Fiber Polymer Laminates. After a quick advent into the failure research of laminates and its heritage, the textual content focuses first on Puck’s fracture standards and offers specific info on their actual heritage, mathematical derivation and alertness. one other center a part of Puck’s conception is his proposal for submit Failure research. right here, too, the actual history and the analytical strategy are offered. The theoretical chapters are accomplished by means of the presentation of the most recent advancements, specifically the dignity of residual stresses and probabilistic results. the second one major a part of the e-book bargains with the broad experimental verification software which has been finished because the mid 1990’s. because of this paintings, the Puck conception should be considered as higher validated than the other idea. All experimental set ups and the key effects are offered and explained.
The publication is intended for all readers who're drawn to the layout and research of composite constructions, together with engineering scholars, scientists and composite designers in undefined.
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Extra resources for Analysis of Failure in Fiber Polymer Laminates: The Theory of Alfred Puck
In the same way as R⊥⊥, the transverse compressive strength R⊥c corresponds to σ⊥c stressing leading to failure in the absence of all other stresses. However, it has been proved that by no means fracture occurs on the action plane of the σ⊥c-stressing but on a plane inclined by some ±54° (see above). On this plane transverse shear stressing τ⊥⊥ is dominant and responsible for IFF. But this experience is also not considered when the transverse compressive strength R⊥c has to be determined. R⊥c is also found by dividing the applied transverse compressive failure load by the area of the cross-section of the specimen.
Attention has to be paid to the fact that R⊥⊥A ≠ R⊥⊥, R⊥||A = Resistance of the action plane against its fracture due to longitudinal shear stressing τ⊥|| acting in that plane. For elementary reasons R⊥||A = R⊥||. Experience has shown that most mechanical engineers are not familiar with the difference between “strength” and “action plane fracture resistance”. It could be helpful to realize the different underlying question. 5 Visualization of the stress/strength problem Preliminary remark: The content of the following chapter is not required to be read by somebody who is interested in the application only of the algorithms of Puck’s laminate failure analysis.
Eq. 23) Looking on (Eq. 23) it is important to remember that the stresses σn(θ), τnt(θ), τn1(θ) are the three stresses which in the most general case are acting simultaneously on one and the same action plane19. The action plane which is inclined by θ = θfp is the fracture plane because on this action plane the risk of fracture is the highest one. 19 That σn, τnt, τn1 have the same action plane can be seen from the index “n” of all three stresses. 48 4 Puck’s action plane fracture criteria If all three stresses σn, τnt, τn1 act simultaneously on an action plane, they represent a combined stressing consisting of a σ⊥-stressing, a τ⊥⊥stressing and a τ⊥||-stressing.
Analysis of Failure in Fiber Polymer Laminates: The Theory of Alfred Puck by Martin Knops