Interlaminar shear strength after high-temperature exposure of polyimide three-dimensional composites

2003 ◽  
Vol 2003.9 (0) ◽  
pp. 195-196
Author(s):  
Ippei SUSUKI ◽  
Takeshi TAKATOYA ◽  
Takahiro MORI ◽  
Yuuhei SAGAWA ◽  
Takao UTSUNOMIYA
Keyword(s):  
Shear Strength ◽  
High Temperature ◽  
Three Dimensional ◽  
Interlaminar Shear Strength ◽  
High Temperature Exposure ◽  
Interlaminar Shear ◽  
Temperature Exposure

scholarly journals Process Chain Development for the Fabrication of Three-Dimensional Braided Oxide Ceramic Matrix Composites

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6338
Author(s):  
Martin Kolloch ◽  
Georg Puchas ◽  
Niels Grigat ◽  
Ben Vollbrecht ◽  
Walter Krenkel ◽  
...  
Keyword(s):  
Shear Strength ◽  
Three Dimensional ◽  
Ceramic Matrix Composites ◽  
Fiber Composites ◽  
Interlaminar Shear Strength ◽  
Oxide Ceramic ◽  
Two Dimensional ◽  
Process Chain ◽  
Fiber Volume ◽  
Interlaminar Shear

Fiber composites with a three-dimensional braided reinforcement architecture have higher fiber volume content and Z-fiber content compared to a two-dimensional braided reinforcement architecture; as a result, the shear strength increases. Porous oxide fiber composites (OFCs) have the inherent weakness of a low interlaminar shear strength, which can be specifically increased by the use of a three-dimensional fiber reinforcement. In this work, the braiding process chain for processing highly brittle oxide ceramic fibers is modified; as a consequence, a bobbin, which protects the filament, is developed and quantitatively evaluated on a test rig with regard to tension and filament breakage. Subsequently, a braiding process is designed which takes into account fiber-protecting aspects, and a three-dimensional reinforced demonstrator is produced and tested. After impregnation with an Al2O3-ZrO2 slurry, by either a prepreg process or a vacuum-assisted process, as well as subsequent sintering, the three-dimensional braid-reinforced OFC exhibits an interlaminar shear strength (ILSS) which is higher than that of two-dimensional braid- or fabric-reinforced samples by 64–95%. The influence of the manufacturing process on the relative macropore content is investigated and correlated with the mechanical properties.

Improvement of interlaminar shear strength of 2.5D fabric laminated composites with short-cut web interlayer

2017 ◽  
Vol 37 (3) ◽  
pp. 261-269 ◽  
Author(s):  
Leilei Song ◽  
Jialu Li ◽  
Yufen Zhao ◽  
Xiaoming Chen ◽  
Li Chen
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Laminated Composites ◽  
Three Dimensional ◽  
Interlaminar Shear Strength ◽  
Bending Properties ◽  
Bending Tests ◽  
Testing Method ◽  
Short Beam ◽  
Interlaminar Shear

Abstract In this study, the short-cut web interlayer and three-dimensional (3D) needle-punched technique were used to improve the interlaminar shear strength (ILSS) of 2.5D fabric laminated composites. The ILSS was measured by the short beam testing method, and the tensile and bending tests were carried out to investigate the in-plane mechanical properties. Observations on microstructure and crack propagation were carried out. The damage mechanisms of different 2.5D fabric laminated composites were analyzed. The results showed that the short-cut web interlayer and 3D needle-punched technique resulted in the improvement of ILSS, and they affected the tensile and bending properties of 2.5D fabric laminated composites.

Influence of microstructural voids on the mechanical and impact properties in commingled E-glass/polypropylene thermoplastic composites

2002 ◽  
Vol 216 (2) ◽  
pp. 85-100 ◽  
Author(s):  
C Santulli ◽  
R Brooks ◽  
C D Rudd ◽  
A C Long
Keyword(s):  
Shear Strength ◽  
Composite Structures ◽  
Three Dimensional ◽  
Interlaminar Shear Strength ◽  
Void Content ◽  
Impact Properties ◽  
Impact Performance ◽  
Impact Tests ◽  
Interlaminar Shear ◽  
The Impact

In recent years, the compression moulding of E-glass/polypropylene commingled composites has been thoroughly investigated. In particular, in the University of Nottingham, a number of studies have been carried out, trying to correlate moulding parameters with mechanical properties and microstructural void content. However, some aspects of commingled composites have received less coverage so far and are therefore dealt with in this paper. These concern the effect of the processing conditions of these materials on interlaminar shear strength and impact properties and the influence of the synergy between processing, microstructure and properties on the impact performance of commingled composite structures. With this aim, flat plaques of E-glass/polypropylene commingled composites with a different fibre architecture (two-and three-dimensional) were non-isothermally compression moulded under various moulding conditions and then tested. The test programme included falling weight impact tests with a staircase procedure, Charpy impact tests and interlaminar shear strength (ILSS) tests. To evaluate the consolidation of the laminates, void content measurement using optical microscopy was related to ILSS and impact test results. In particular, the specific issues arising in moulding laminates with added three-dimensional fibres were studied. These include correct placement of the tow, sufficient preheating of thick laminates and nesting of the layers during moulding. The results of these tests are discussed in the light of the moulding conditions and quality, and conclusions are drawn regarding optimum moulding conditions for impact performance. Finally, indications on the reliability and possible improvement of the moulding procedure to yield a sufficient moulding quality, even with large thickness, are also provided. The knowledge acquired on material consolidation properties is applied in the manufacture of an automotive side intrusion beam: problems due to the scale effect are also discussed.

scholarly journals Development of Graphite Jig-Assembly for High Temperature Interlaminar Shear Strength Testing with Double-Notched Specimen Configuration Subjected to Compressive Load

TANSO ◽  
2002 ◽  
Vol 2002 (203) ◽  
pp. 117-119
Author(s):  
Yasuhiro Tanabe ◽  
Hajime Ishii ◽  
Shin Nakanishi ◽  
Takashi Akatsu ◽  
Eiichi Yasuda
Keyword(s):  
Shear Strength ◽  
High Temperature ◽  
Compressive Load ◽  
Interlaminar Shear Strength ◽  
Strength Testing ◽  
Notched Specimen ◽  
Interlaminar Shear

Mechanical properties of multiwall carbon nanotubes/unidirectional carbon fiber-reinforced epoxy hybrid nanocomposites in transverse and longitudinal fiber directions

2021 ◽  
pp. 096739112098651
Author(s):  
Saeedeh Saadatyar ◽  
Mohammad Hosain Beheshty ◽  
Razi Sahraeian
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Epoxy Resin ◽  
Interlaminar Shear Strength ◽  
Lap Shear Strength ◽  
Transverse Tensile ◽  
Lap Shear ◽  
Longitudinal Fiber ◽  
Interlaminar Shear ◽  
Multiwall Carbon

Unidirectional carbon fiber-reinforced epoxy (UCFRE) is suffering from weak transverse mechanical properties and through-thickness properties. The effect of different amount (0.1, 0.3 and 0.5 phr which is proportional to 0.09, 0.27 and 0.46 wt%, respectively) of multiwall carbon nanotube (MWCNT), on transverse tensile properties, flexural strength, fracture toughness in transverse and longitudinal fiber directions, interlaminar shear strength and lap shear strength of UCFRE has been investigated. Dicyandiamide was used as a thermal curing agent of epoxy resin. MWCNT was dispersed in the epoxy resin by ultrasonic instrument and their dispersion state was investigated by scanning electron microscopy (SEM). The curing behavior of epoxy resin and its nanocomposites was assessed by differential scanning calorimetry. Results show that transverse tensile strength, modulus and strain-at-break were increased by 28.5%, 25% and 14%, respectively by adding 0.1 phr of MWCNT. Longitudinal flexural properties of UCFRE was not changed by adding different amount of MWCNT. Although longitudinal flexural strength was increased by 5% by adding 0.1 phr of MWCNT. Fracture toughness in transverse and longitudinal fiber directions was increased by 39% and 9%, respectively at 0.3 phr of MWCNT. Results also show that interlaminar shear strength and lap shear strength were increased at 0.3 phr of MWCNT by 8% and 5%, respectively. These increases in mechanical properties were due to the good adhesion of fibers to the matrix, interlocking and toughening action of MWCNT as revealed by SEM.

Effect of consolidation force on interlaminar shear strength of CF/PEEK laminates manufactured by laser-assisted forming

2021 ◽  
Vol 266 ◽  
pp. 113779
Author(s):  
Qiuyu Miao ◽  
Zhihong Dai ◽  
Guangyi Ma ◽  
Fangyong Niu ◽  
Dongjiang Wu
Keyword(s):  
Shear Strength ◽  
Interlaminar Shear Strength ◽  
Interlaminar Shear
Sign in / Sign up

Export Citation Format

Share Document