Crack growth in discontinuous glass fibre reinforced polypropylene under dynamic and static loading conditions

2002 ◽  
Vol 33 (11) ◽  
pp. 1539-1547 ◽  
Author(s):  
A Pegoretti ◽  
T Ricco
Keyword(s):  
Crack Growth ◽  
Glass Fibre ◽  
Static Loading ◽  
Loading Conditions ◽  
Glass Fibre Reinforced

Fatigue Crack Growth Tests on Glass Fibre Reinforced Polymer Matrix Composite

2005 ◽  
Vol 473-474 ◽  
pp. 189-194
Author(s):  
Zilia Csomós ◽  
János Lukács
Keyword(s):  
Cyclic Loading ◽  
Crack Opening Displacement ◽  
Matrix Composite ◽  
Glass Fibre ◽  
Crack Opening ◽  
Loading Conditions ◽  
Opening Displacement ◽  
Interfacial Cracks ◽  
Glass Fibre Reinforced ◽  
Number Of Cycles

E-glass fibre reinforced polyester matrix composite was investigated, which was made by pullwinding process. Round three point bending (RTPB) specimens were tested under quasi-static and mode I cyclic loading conditions. Load vs. displacement (F-f), load vs. crack opening displacement (F-v) and crack opening displacement range vs. number of cycles (ΔCOD-N) curves were registered and analysed. Interfacial cracks were caused the final longitudinal fracture of the specimens under quasi-static and cyclic loading conditions.

Flexural behaviour of glass fibre-reinforced plastic laminates with drilled hole

2012 ◽  
Vol 226 (2) ◽  
pp. 149-158 ◽  
Author(s):  
P K Rakesh ◽  
I Singh ◽  
D Kumar
Keyword(s):  
Glass Fibre ◽  
Polymer Matrix Composites ◽  
Element Model ◽  
Hole Drilling ◽  
Loading Conditions ◽  
Flexural Behaviour ◽  
Reinforced Plastic ◽  
Glass Fibre Reinforced Plastic ◽  
Glass Fibre Reinforced ◽  
Plastic Laminates

Drilling is one of the most commonly used process for hole making. Drilling of polymer matrix composites (PMCs) causes substantial damage around the drilled hole. Drilling-induced damage not only decreases the strength of the composite laminate with hole, but it also deteriorates the long-term performance of the PMC laminates under different loading conditions. In the present research investigation, the flexural behaviour of the glass fibre-reinforced plastic laminates with drilled hole was experimentally investigated under three-point loading conditions. The results of the experimental investigation were compared with those of the finite element model and were found to be in close agreement.

Crack Growth Behavior of Aluminum Alloys Tested in Liquid Mercury

1986 ◽  
Vol 108 (1) ◽  
pp. 37-43 ◽  
Author(s):  
J. A. Kapp ◽  
D. Duquette ◽  
M. H. Kamdar
Keyword(s):  
Growth Rate ◽  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Crack Growth Rate ◽  
Intensity Factor ◽  
Crack Growth ◽  
Static Loading ◽  
Fatigue Loading ◽  
Loading Conditions ◽  
Fixed Load

Crack growth rate measurements have been made in three mercury embrittled aluminum alloys each under three loading conditions. The alloys were 1100-0, 6061-T651, and 7075-T651. The loading conditions were fixed displacement static loading, fixed load static loading, and fatigue loading at two frequencies. The results showed that mercury cracking of aluminum was not unlike other types of embrittlement (i.e. hydrogen cracking of steels). Under fixed load static conditions no crack growth was observed below a threshold stress intensity factor (KILME). At K levels greater than KILME cracks grew on the order of cm/s, while under fixed displacement loading, the crack growth rate was strongly dependent upon the strength of the alloy tested. This was attributed to crack closure. In the fatigue tests, no enhanced crack growth occurred until a critical range of stress intensity factor (ΔKth) was achieved. The ΔKth agreed well with the KILME obtained from the static tests, but the magnitude of the fatigue growth rate was substantially less than was expected based on the static loading results. Observations of the fracture surfaces in the SEM suggested a brittle intergranular fracture mode for the 6061-T651 and the 7075-T651 alloys under all loading conditions. The fractographic features of the 1100-0 alloy under fixed load and fatigue loading conditions were also brittle intergranular. Under fixed displacement loading the cracks grew via a ductile intergranular mode.

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