Theoretical analysis and experimental investigation of the occurrence of fiber bridging in unidirectional laminates under Mode I loading

2021 ◽  
Vol 257 ◽  
pp. 113383
Author(s):  
Weiling Liu ◽  
Puhui Chen
Keyword(s):  
Experimental Investigation ◽  
Theoretical Analysis ◽  
Mode I ◽  
Fiber Bridging ◽  
Mode I Loading

A mesh-free simulation of mode I delamination of composite structures

2014 ◽  
Vol 21 (1) ◽  
pp. 137-149
Author(s):  
Goudarz Ghanizadeh Hesar ◽  
Yeliz Pekbey ◽  
Hasan Yildiz ◽  
Farshid Khosravi Maleiki
Keyword(s):  
Experimental Investigation ◽  
Composite Laminates ◽  
Composite Structures ◽  
Degrees Of Freedom ◽  
Meshfree Method ◽  
Iterative Solution ◽  
Mode I ◽  
Delamination Growth ◽  
Mode I Loading ◽  
Mode I Delamination

AbstractA numerical and experimental investigation for the analysis of delamination problem under mode I loading in composite material is presented. Firstly, the simulation of the delamination under mode I loading and failure of composite materials based on the cohesive segments model is investigated by using the meshfree method. With the partition of unity of moving least-squares shape functions, the discontinuities at the cohesive segments are approximated with additional degrees of freedom at the nodes. An iterative solution scheme between the continuous and discontinuous fields is presented to solve mode I delamination growth. Secondly, to verify the meshfree method’s results, an experimental investigation and the finite element method were used for the simulation of delamination. The experimental study used a double-cantilever beam made of carbon/epoxy laminate (AS4/3501-6) which consists of 10 plies in [0]10 and [0/90/0/90/0]s layup with delamination inserted in the middle of the laminate. The critical fracture force, which can be experimentally measured, was used to calculate the mode I delamination fracture toughness of the carbon/epoxy laminate. Results obtained from the meshfree method showed very good agreement with experimental data for single-mode delamination under mode I loading. The meshfree method could also be used effectively to produce delamination growth in composite laminates and is especially suitable for the simulation of complex delamination patterns that are difficult to model using traditional numerical methods.

Towards pure mode I loading in dissimilar adhesively bonded double cantilever beams

2021 ◽  
Vol 107 ◽  
pp. 102826
Author(s):  
M. Moazzami ◽  
M.R. Ayatollahi ◽  
S. Teixeira de Freitas ◽  
L.F.M. da Silva
Keyword(s):  
Mode I ◽  
Pure Mode ◽  
Cantilever Beams ◽  
Adhesively Bonded ◽  
Mode I Loading ◽  
Double Cantilever Beams

Theoretische Analyse eines neuen Loslagerkonzepts*/Theoretical analysis of a new floating bearing - The simulated operational behavior of FRB bearings in comparison to reference bearings

2015 ◽  
Vol 105 (05) ◽  
pp. 285-290
Author(s):  
C. Brecher ◽  
M. Fey ◽  
J. Falker
Keyword(s):  
Experimental Investigation ◽  
Theoretical Analysis ◽  
High Speed ◽  
Contact Point ◽  
Ball Bearings ◽  
Roller Bearings ◽  
Cylindrical Roller ◽  
Bearing System

Das Floating-Roller-Ball (FRB)-Lager ist ein Konzept für Radiallager als Loslager für Hochgeschwindigkeits-Motorspindeln, das die Vorteile von Zylinderrollenlagern und angestellten Mehrpunktlagern in einer neuen Wälzkörpergeometrie kombiniert. Zur Auslegung des ersten Prototyps wurde mithilfe eines Berechnungstools das theoretische Betriebsverhalten untersucht. Die Berechnungsergebnisse liefern Randbedingungen als Grundlage zur experimentellen Untersuchung des Lagerkonzepts.   Floating roller ball bearings provide a new floating bearing system for high-speed motor spindles, combining the advantages of both cylindrical roller bearings and elastically mounted multi-contact point bearings in a new roller geometry. To design the first prototype, the operational behavior of the bearing system was analyzed theoretically by a new calculation tool. The results provide the basis for the experimental investigation of the bearing concept.

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