In-plane shear testing of medium and high modulus woven graphite fiber reinforced/polyimide composites

Gentz, M.; Armentrout, D.; Rupnowski, P.; Kumosa, L.; Shin, E. Eugene; Sutter, J. K.; Kumosa, M.

doi:10.1016/s0266-3538(03)00260-4

Cited by 55 publications

(22 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Iosipescu and 10 off-axis tests of a Gr-epoxy unidirectional composite at room temperature resulted in a shear strength of approximately 70 MPa [22], somewhat lower than the 115-130 MPa room temperature strengths reported here. Iosipescu shear test results for a T650-35/PMR-15, woven, Gr-Pi composite yielded shear strengths of approximately 115 MPa at room temperature and 65 MPa at 315 C [30], similar to the values of 120-127 MPa at room temperature and 59-61 MPa at 315 C reported here for the unidirectional T650-35/HFPE-II-52 laminates.…”

Section: Resultssupporting

confidence: 79%

“…Other polyimides appear not to be affected by moisture so strongly. For example, shear tests of dry, wet and thermally cycled wet PMR-II-50 matrix laminates show that the shear strength is changed little by moisture, while the stress for the onset of tow cracking (detected by acoustic emission) increases substantially after hydrothermal cycling [30]. This is attributed to the relaxation of residual stresses due to swelling and due to the formation of tow cracks.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

High Temperature Shear Strength of T650-35/HFPE-II-52 Polyimide Matrix Unidirectional Composite

Bhargava

Zehnder

2006

Exp Mech

View full text Add to dashboard Cite

The shear strength of a 4-ply unidirectional composite laminate consisting of carbon fibers (T650-35) and a polyimide matrix (HFPE-II-52) was measured over a temperature range of 25 to 315 C. The tests were performed using a Iosipescu test sample, modified to provide a more uniform shear stress distribution across the gauge section and loaded with an Arcan type test fixture. The test specimen design is based on the results of an extensive finite element study. Shear strength tests were performed on dry, 50% RH and 100% RH moisture saturated samples. Results of the experiment show that shear strength decreases from approximately 120 MPa at 25 C to 60 MPa at 315 C and that moisture saturated samples have a 5-10 MPa lower shear strength than dry samples.

show abstract

Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

High Temperature Shear Strength of T650-35/HFPE-II-52 Polyimide Matrix Unidirectional Composite

Bhargava

Zehnder

2006

Exp Mech

View full text Add to dashboard Cite

show abstract

“…1. Transverse tow micro-cracks in a woven graphite fiber polyimide composite [5]. Individual tow micro-crack from (a) [5].…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

“…Transverse tow micro-cracks in a woven graphite fiber polyimide composite [5]. Individual tow micro-crack from (a) [5]. stress relaxation modulus for continuously aging neat PMR-15 in nitrogen at 316°C was derived using KamvourisÕ [4] short-time test data (about 30 min), for neat PMR-15 that was aged for times up to 800 h. in N 2 at 316°C.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

“…For PMR-15 polyimide/ carbon fiber composites the structural changes at high temperatures are due to physical and chemical aging as well as thermal degradation of the glass forming matrix material [2][3][4]. Aging and cooling residual stresses in woven polyimide matrix carbon fiber composites may be high enough to create transverse tow micro-cracks [5]. Examples of such micro-cracks are shown in Figs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Residual stresses in unidirectional graphite fiber/polyimide composites as a function of aging

Gentz

Benedikt

Sutter

et al. 2004

Composites Science and Technology

Self Cite

View full text Add to dashboard Cite

Insight into the nondestructive performance evaluation of fiber‐reinforced polymer composite laminate immersed in produced water using embedded fiber Bragg grating sensor

et al. 2021

View full text Add to dashboard Cite

Fiber-reinforced polymer (FRP) composites are exposed to various corrosive media during their service life, which adversely affects their material properties. Here, a novel approach is developed to investigate the long-term performance of glass FRP composite laminate immersed in produced water generated in oil fields. This is achieved by monitoring the internal hygroscopic strain developed over the aging time using embedded fiber Bragg grating sensor. Composite material strength reduction over the immersion time is evaluated by conducting destructive mechanical tests at regular intervals, and the mechanism of property degradation is established. It is observed that property degradation follows first-order kinetics and absorption of produced water medium obeys dual-sorption diffusion kinetics. Moreover, the strain developed within the composite laminate is formulated by considering the unified influence of swelling and chemical degradation. The predicted strain closely interprets the experimentally recorded strain. This work proves that the strain measurement is an effective nondestructive technique to estimate the property of FRP composite laminates on a real-time basis.

show abstract

In-plane shear testing of medium and high modulus woven graphite fiber reinforced/polyimide composites

Cited by 55 publications

References 11 publications

High Temperature Shear Strength of T650-35/HFPE-II-52 Polyimide Matrix Unidirectional Composite

High Temperature Shear Strength of T650-35/HFPE-II-52 Polyimide Matrix Unidirectional Composite

Residual stresses in unidirectional graphite fiber/polyimide composites as a function of aging

Insight into the nondestructive performance evaluation of fiber‐reinforced polymer composite laminate immersed in produced water using embedded fiber Bragg grating sensor

Contact Info

Product

Resources

About