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Keywords: strain energy release rate
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eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1997
ISBN-10: 0-8031-2411-2
ISBN: 978-0-8031-2411-0
... It is proposed that the fracture surface of delaminated specimens, and hence the critical strain energy release rate, is dependent on both the mode of fracture and the orientation of the plies on either side of the delamination with respect to the propagation direction. Recent fractographs...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1997
ISBN-10: 0-8031-2424-4
ISBN: 978-0-8031-2424-0
... to evaluate both static and fatigue properties. Results obtained thus far indicate that the greatest loss in strength occurs after aging in air at the highest aging temperature of 204°C. Strain energy release rate G values obtained from the static DCB tests dropped by 10 to 20% after aging for periods of up...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1997
ISBN-10: 0-8031-2411-2
ISBN: 978-0-8031-2411-0
... problem is developed. A force-deformation relationship for the delaminated plate is derived. A change in total strain energy release rate and extension-twist coupling with crack length is calculated. The distribution of interlaminar shear and peel stresses on the interface containing the delamination...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1997
ISBN-10: 0-8031-2411-2
ISBN: 978-0-8031-2411-0
.... The governing equations and boundary conditions are obtained from the principle of virtual work. The analysis of the [90/(±45) n /(∓45) n /90] s edge crack torsion (ECT) Mode III test layup indicates that there are no hygrothermal effects on the Mode III strain energy release rate because the laminate...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1996
ISBN-10: 0-8031-2404-X
ISBN: 978-0-8031-2404-2
... is identified. The effects of free-edge delamination on the torsional stiffness and total strain energy release rate of a family of symmetric laminates containing 0, 90, and ±45 layers are studied. Favorable layups for the Mode III interlaminar fracture toughness characterization are recommended. Effective...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1996
ISBN-10: 0-8031-2404-X
ISBN: 978-0-8031-2404-2
... less conservative than using a Mode I failure criterion, although the predictions were still conservative. mixed-mode analyses delamination (materials) bimaterial interfaces strain energy release rate composite materials testing design Roderick H. Martin, 1 P. Sriram, 2 and Steven J. H o...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1995
ISBN-10: 0-8031-1882-1
ISBN: 978-0-8031-1882-9
... The crack tip deformations and strain energy release rates were calculated for interface cracks in multilayer ceramic coatings subjected to transient heating followed by cooling. It was shown that the interface nearest to the surface of the coating experiences the largest G. As the length...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1995
ISBN-10: 0-8031-1882-1
ISBN: 978-0-8031-1882-9
... predict both when and where cracking will occur. This design tool can now be used to design thermoelectric cells that will survive the severe manufacturing environment. bonded material systems thermoelectric cell strain energy release rate mismatch stress residual thermal stress fail safe...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1995
ISBN-10: 0-8031-2012-5
ISBN: 978-0-8031-2012-9
... of 5 Hz and a displacement ratio of 0.1. Delamination growth per fatigue loading cycle, da/dN , was related to the strain energy release rate (SERR) G II associated with the Mode II (forward shear) loading. G was determined by an experimental compliance calibration procedure, correlating observed...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1993
ISBN-10: 0-8031-1498-2
ISBN: 978-0-8031-1498-2
...-D finite element analyses were conducted to determine the stress distribution in an undamaged curved laminate. The finite element analysis was also used to determine values of strain energy release rate at a delamination emanating from a matrix crack in a 90° ply. Experimentally, transverse tensile...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1993
ISBN-10: 0-8031-1498-2
ISBN: 978-0-8031-1498-2
... thermal cycling (77 to 373 K) is investigated. The changes in expansion coefficient are affected by the growth of 0° ply cracks in addition to the 90° ply cracks. The crack growth rate/cyclic strain energy release rate range data are compared with those reported previously for mechanical fatigue cycling...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1993
ISBN-10: 0-8031-1498-2
ISBN: 978-0-8031-1498-2
... conducted by cyclically loading specimens until delamination growth was detected. The fatigue fracture threshold was defined to be the maximum cyclic strain energy release rate, G max , below which no delamination growth would occur in less than 1 × 10 6 cycles. For the DCB specimens, consistent values...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1993
ISBN-10: 0-8031-1498-2
ISBN: 978-0-8031-1498-2
... of moisture sorptions on critical strain energy release rates, G Ic and G IIc , respectively. These data are compared with baseline data obtained for specimens tested in the room temperature dry (RTD) condition. This phase of the study revealed that moisture absorption of either water or jet fuel tends...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1993
ISBN-10: 0-8031-1498-2
ISBN: 978-0-8031-1498-2
... A simple analytical model is developed to predict the interlaminar stresses and the total strain energy release rate for delaminated unsymmetrical laminates. The method is based on a shear deformation theory and a sublaminate approach. The solution is obtained in closed form, and the controlling...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1993
ISBN-10: 0-8031-1491-5
ISBN: 978-0-8031-1491-3
.... The prediction methodology determines the strain energy release rate, G , at the edge of a laminate and compares it with the mode I fatigue and fracture toughness of the composite. To verify the methodology, isothermal static tests at 23°C, 125°C, and 175°C and tension-tension fatigue tests at 23°C and 175°C...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1426-5
ISBN: 978-0-8031-1426-5
... was assumed to initiate at the location of the highest radial stress in the curved region. A closed form curved beam elasticity solution and a two-dimensional finite element analysis (FEA) were conducted to determine this location. The variation in the strain energy release rate, G , with delamination growth...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1440-0
ISBN: 978-0-8031-1440-1
... expressions for the interlaminar stresses and total strain energy release rate in terms of the laminate stiffness coefficients are provided. Two sublaminate models are used for the interlaminar stress analysis and for the delamination analysis. The method is applied to the analysis of [0] 16 and [0/90] 4s...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1991
ISBN-10: 0-8031-1419-2
ISBN: 978-0-8031-1419-7
... A test fixture for testing a thick split cantilever beam for scissoring delamination (Mode III) fracture toughness was developed. A three-dimensional finite element analysis was conducted on the test specimen to determine the strain energy release rate, G , distribution along the delamination...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1991
ISBN-10: 0-8031-1419-2
ISBN: 978-0-8031-1419-7
.... Hygrothermal effects are included in all the models to make the comparisons realistic. graphite composites graphite/epoxy delamination strain energy release rate fracture mechanics composite materials fracture fatigue (materials) Erian A. Armanios, ~P. Sriram, 'and Ashraf M. Badir I Fracture...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1991
ISBN-10: 0-8031-1419-2
ISBN: 978-0-8031-1419-7
... that for both cases the most likely place for an opening (Mode I) delamination to originate is at the junction of the tapered and thin regions. For each material type, the models were used to calculate the strain energy release rate, G , associated with delaminations originating at that junction and growing...