Effects of Production Variables on Stress-Strain Behavior of Glass/Epoxy Textile Composites in Compression Molding

2000 ◽  
Author(s):  
Sabit Adanur ◽  
Levent Onal
Keyword(s):  
Volume Fraction ◽  
Textile Composites ◽  
Molding Pressure ◽  
Stress And Strain ◽  
Curing Agent ◽  
Reinforced Composites ◽  
Mixing Ratio ◽  
Strain Behavior ◽  
Production Parameters ◽  
Glass Reinforced Composites

Abstract The production parameters of glass-reinforced composites have a significant effect on the tensile properties of the material. The effects of manufacturing characteristics such as molding time, molding temperature, molding pressure and mixing ratio of epoxy resin and curing agent on stress and strain values of the composites were examined at the same volume fraction ratio.

Impact Failure Analysis of Glass/Epoxy Textile Composites

2000 ◽  
Author(s):  
Sabit Adanur ◽  
Levent Onal
Keyword(s):  
Failure Analysis ◽  
Volume Fraction ◽  
Textile Composites ◽  
Molding Pressure ◽  
Curing Agent ◽  
Mixing Ratio ◽  
Production Parameters ◽  
Number Of Layers ◽  
The Impact ◽  
Composite Properties

Abstract The production parameters of composites are effective on the impact properties of the material. The effects of the number of layers, thickness, manufacturing characteristics such as molding time, molding temperature, molding pressure and the mixing ratio of epoxy resin and curing agent were examined at the same volume fraction ratio. There is an optimum point for most of the variables. Parameters below and above of this point lead an increase in deflection level. Impact velocity is effective on the composite properties as well.

scholarly journals Forming Limit Stress Diagram Prediction of Pure Titanium Sheet Based on GTN Model

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1783 ◽  
Author(s):  
Tao Huang ◽  
Mei Zhan ◽  
Kun Wang ◽  
Fuxiao Chen ◽  
Junqing Guo ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Pure Titanium ◽  
Void Volume Fraction ◽  
Void Volume ◽  
Forming Limit ◽  
Stress And Strain ◽  
Gtn Model ◽  
Stress Diagram ◽  
Limit Stress ◽  
Hemispherical Punch

In this paper, the initial values of damage parameters in the Gurson–Tvergaard–Needleman (GTN) model are determined by a microscopic test combined with empirical formulas, and the final accurate values are determined by finite element reverse calibration. The original void volume fraction (f0), the volume fraction of potential nucleated voids (fN), the critical void volume fraction (fc), the void volume fraction at the final failure (fF) of material are assigned as 0.006, 0.001, 0.03, 0.06 according to the simulation results, respectively. The hemispherical punch stretching test of commercially pure titanium (TA1) sheet is simulated by a plastic constitutive formula derived from the GTN model. The stress and strain are obtained at the last loading step before crack. The forming limit diagram (FLD) and the forming limit stress diagram (FLSD) of the TA1 sheet under plastic forming conditions are plotted, which are in good agreement with the FLD obtained by the hemispherical punch stretching test and the FLSD obtained by the conversion between stress and strain during the sheet forming process. The results show that the GTN model determined by the finite element reverse calibration method can be used to predict the forming limit of the TA1 sheet metal.

scholarly journals Multiscale thermomechanical modeling of short fiber-reinforced composites

2017 ◽  
Vol 24 (5) ◽  
pp. 765-772 ◽  
Author(s):  
Dawei Jia ◽  
Huiji Shi ◽  
Lei Cheng
Keyword(s):  
Thermal Loading ◽  
Volume Fraction ◽  
Numerical Procedure ◽  
Thermal Conditions ◽  
Cyclic Hardening ◽  
Short Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Thermomechanical Modeling

AbstractA study of the micromechanical behavior to predict the overall response of short fiber-reinforced composites under cyclic mechanical and thermal loading is presented. The instantaneous average over a “representative volume” of the material is considered. The influence of the short fiber’s aspect ratio, volume fraction, and spatial orientation has been investigated. The linear combined hardening model is used to describe the cyclic hardening effects in the case of metal matrix. A numerical procedure is used to predict the response of composites under mechanical and thermal conditions. The results of the numerical procedure have been compared to the results of three different models and to published experimental data.

Experimental and Analytical Resin Impregnation Characterization in Carbon Fiber Reinforced Thermoplastic Composites

2020 ◽  
Author(s):  
Satoshi Kobayashi ◽  
Toshiko Osada
Keyword(s):  
Carbon Fiber ◽  
Optical Microscope ◽  
Textile Composites ◽  
Continuity Condition ◽  
Thermoplastic Composites ◽  
Molding Pressure ◽  
Cross Sectional ◽  
Molding Temperature ◽  
Resin Impregnation ◽  
Molding Condition

Abstract Effect of molding condition on resin impregnation behavior and the associated mechanical properties were investigated for carbon fabric reinforced thermoplastic composites. Carbon fiber yarn (TORAYCA, Toray) was used as a reinforcement, and thermoplastic PI (AURUM PL 450 C, Mitsui Chemicals) was used as the matrix. CFRTP textile composites were compression-molded with a hot press system under the molding temperature, 390 °C, 410 °C and 430 °C, molding pressure 2 MPa and 4 MPa and molding time 0∼300 s. In order to evaluate the impregnated state, cross sectional observation was performed with an optical microscope. Specimen cross-section was polished and finished with alumina slurry for a clear observation. The images observed were processed through image processing software to obtained impregnation ratio which defined as the resin impregnation area to the cross-sectional area of a fiber yarn. Resin impregnation was accelerated with molding temperature and pressure. At molding temperature more than 410 °C, resin impregnation was similar irrespective of temperature. Tensile test results indicated that modulus and strength increased with resin impregnation. Resin impregnation during molding was predicted using the analytical model based on Darcy’s law and continuity condition. The analysis could successfully predict the impregnation behavior despite the difference in molding pressure and temperature.

Micromechanical Simulation Approach of Dual Phase Steel Artificial Microstructure Using Random Field Model

2021 ◽  
Vol 1016 ◽  
pp. 534-540
Author(s):  
Mohamed Imad Eddine Heddar ◽  
Nadjoua Matougui ◽  
Brahim Mehdi
Keyword(s):  
Grain Size ◽  
Random Field ◽  
Dual Phase Steel ◽  
Field Model ◽  
Volume Fraction ◽  
Gaussian Kernel ◽  
Dual Phase ◽  
Strain Behavior ◽  
Proportional Relationship ◽  
Dp Steels

In this study, a random field (RF) model with a Gaussian kernel was applied to generate an artificial microstructure of dual phase (DP) steels. Micrographs obtained from Scanning Electron Microscopy (SEM) were analyzed using image processing software to extract the grain size and the volume fraction of each phase. Based on watershed (Ws) segmentation and quantitative analysis, the real and artificial microstructures were compared by analyzing grain features related the solidity, grain size and aspect ratio (the proportional relationship between its width and its height). Consequently, this approach allows to simulate the overall stress-strain behavior of the analyzed microstructures. As a result, it was shown that the strain localization starts to develop at the ferrite/martensite interface and that the RF model could replicate the micromechanical behavior of DP steels.

Bridging and caging in mixed suspensions of microsphere and adsorptive microgel

Soft Matter ◽  
2014 ◽  
Vol 10 (44) ◽  
pp. 8905-8912 ◽  
Author(s):  
Chuanzhuang Zhao ◽  
Guangcui Yuan ◽  
Charles C. Han
Keyword(s):  
Glass Transition ◽  
Volume Fraction ◽  
Mixing Ratio ◽  
Mixed Suspension

Gelation and glass transition in a mixed suspension of polystyrene (PS) microsphere and poly(N-isopropylacrylamide) (PNIPAM) microgel were studied as a function of the total colloid volume fraction and mixing ratio of these two components.

Oxynitride Glass Reinforced Cement Composites

1990 ◽  
Vol 211 ◽  
Author(s):  
Gary. L. Leatherman ◽  
Tahar El-Korchi ◽  
Thomas M. Holmes ◽  
R. Nathan Katz
Keyword(s):  
Surface Chemistry ◽  
Accelerated Aging ◽  
Oxide Glass ◽  
Cement Composites ◽  
Reinforced Composites ◽  
Glass Fiber Reinforced ◽  
Oxynitride Glass ◽  
Reinforced Cement ◽  
The Difference ◽  
Glass Reinforced Composites

AbstractGlass fiber reinforced composites made with an oxynitride analogue of alkali resistant glass were tested in tension after accelerated aging. The results were compared to composites made from oxide alkali resistant glass. The strength of the oxynitride glass reinforced composites was almost double that of the oxide glass based material. The results are related to the improved properties of oxynitride glass over oxide glass. In particular previous work has shown that surface chemistry of the oxynitride glass inhibits the formation of a strong bond between fiber and matrix. The difference in surface chemistry was examined by measuring the contact angle of aqueous solutions with respect to nitrogen content of the glass.

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