scholarly journals COMPRESSIVE RESIDUAL STRENGTH PREDICTION IN FIBER-REINFORCED LAMINATED COMPOSITES SUBJECTED TO IMPACT LOADS

Fracture 84 ◽  
1984 ◽  
pp. 2897-2907 ◽  
Author(s):  
V. Sarma Avva ◽  
H.L. Padmanabha
Keyword(s):  
Residual Strength ◽  
Laminated Composites ◽  
Strength Prediction ◽  
Impact Loads ◽  
Fiber Reinforced

Residual strength of laminated composites after impact

2010 ◽  
Vol 45 (9) ◽  
pp. 1031-1043 ◽  
Author(s):  
V. Kamala Kannan ◽  
A. Rajadurai ◽  
B. Nageswara Rao
Keyword(s):  
Residual Strength ◽  
Laminated Composites ◽  
Empirical Relation ◽  
Laminated Composite ◽  
Fracture Analysis ◽  
Static Strength ◽  
Impact Loads ◽  
Strength Assessment ◽  
The Impact ◽  
Made In

This article deals with the residual strength assessment on completely as well as partially penetrated laminated composites due to impact loads by idealizing the damage locations as holes and cracks. Modifications are made in the inherent flaw model (IFM) of Waddoups, Eisenman, and Kaminski (known as the WEK model) to correlate the fracture data of laminated composites. For velocities above complete penetration, the residual strength is identical to the static strength of the laminated composite with a hole having the same diameter as the impacting particle. For this case, the inherent flaw length ahead of the notch is correlated with notched and un-notched strengths through fracture parameters. For the case where the impact velocities are less than the penetration velocity, an empirical relation is proposed following the IFM for the residual strength in terms of kinetic energy of the impact. The adequacy of the modified IFM is demonstrated through comparison of fracture analysis results with tensile, compressive, and impact fracture strength of laminated composites containing holes and cracks.

scholarly journals Research on Residual Strength Prediction Model of Corroded Pipeline Based on Improved PSO-BP

2021 ◽  
Vol 687 (1) ◽  
pp. 012007
Author(s):  
Li Tingke ◽  
Peng Yuanchun ◽  
Li Jiadi ◽  
Dulin ◽  
Lian Xingqin
Keyword(s):  
Prediction Model ◽  
Residual Strength ◽  
Strength Prediction ◽  
Improved Pso

Strength Prediction of Laminated Composites upon Independent Constituent Properties

2015 ◽  
Vol 665 ◽  
pp. 153-156
Author(s):  
Zheng Ming Huang ◽  
Li Min Xin
Keyword(s):  
Ultimate Strength ◽  
Input Data ◽  
Laminated Composites ◽  
Laminated Composite ◽  
Failure Detection ◽  
Strength Prediction ◽  
Internal Stresses ◽  
Matrix Properties

To predict ultimate strength of a laminated composite subjected to any load only using its constituent fiber and matrix properties measured independently, three challenging problems must be resolved with high success. First, internal stresses in the fiber and matrix must be accurately determined. Second, efficient failure detection for laminae and laminate upon the internal stresses must be achieved. Last but not the least, input data for the in-situ strengths of the constituents must be defined correctly from their original counterparts, as the former, different from the latter, are immeasurable. This presentation briefly summarizes our work on the targeted subject. All of the three issues have been systematically addressed with reasonable success.

Study on Fiber-Reinforced Laminated Composite Textile Tearing Behavior and Strength Prediction

2014 ◽  
Vol 651-653 ◽  
pp. 1370-1373
Author(s):  
Yun Chao Gu ◽  
Long Bin Liu ◽  
Shuai Cao ◽  
Hou Di Xiao ◽  
Ming Yun Lv
Keyword(s):  
Engineering Application ◽  
Laminated Composite ◽  
Initial Crack ◽  
Strength Prediction ◽  
Deformation Analysis ◽  
Fiber Reinforced ◽  
Mechanics Performance ◽  
Envelope Material ◽  
Safety And Stability ◽  
Tearing Strength

The tearing behavior of fiber-reinforced laminated composite textile plays the key role in the decision of mechanics performance of high altitude airship envelop material, even directly deciding its safety and stability. This paper, based on typical woven fabricated fiber yarns’ characteristics of geometry and mechanics, adopts Euler-displacement deformation analysis to explore yarn bundles deformation effects on tearing behavior and strength of envelope material with prefabricated damage and crack. Also, models with prefabricated crack with different size and textile density are respectively built to find factors that affect tearing behavior and strength of envelope material. From tests, it can be observed that the built models for predicting its tearing strength are in conformity with the experimental data. Nonlinear relationship is reflected between the initial crack width or yarn bundles density with tearing strength. Conclusively, the methods and models adopted in this paper provide an effective and innovative mind on tearing behavior and strength of fiber reinforced envelope material and make the foundation for its engineering application.

Flexural Performance Evaluation of Fiber-Reinforced Concrete Incorporating Multiple Macro-Synthetic Fibers

2018 ◽  
Vol 2672 (27) ◽  
pp. 1-12 ◽  
Author(s):  
Michael Dopko ◽  
Meysam Najimi ◽  
Behrouz Shafei ◽  
Xuhao Wang ◽  
Peter Taylor ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Residual Strength ◽  
Performance Enhancement ◽  
Construction Material ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Test Beam ◽  
Synthetic Fibers ◽  
Flexural Performance ◽  
Strength And Toughness

Fiber-reinforced concrete (FRC) is a promising construction material mainly because of the crack-controlling mechanisms that discrete fibers can impart to inherently brittle concrete. Macrofibers, in particular, have been proven effective for providing post-crack ductility and toughness, while synthetic fibers are a promising solution to avoid corrosion-related durability issues. To assess the performance enhancement provided by macro-synthetic concrete fibers, this study performs flexural tests on FRC beams containing three different types of macro-synthetic fibers. The selected fibers include polypropylene (PP), polyvinyl alcohol (PVA), and alkali-resistant glass (ARG) macrofibers mixed at volume fractions of 0.5%, 1.0%, and 1.5%. Static and dynamic fresh properties are monitored using the vibrating Kelly ball (VKelly) test. Beam specimens are then placed under a third point bending configuration, as per ASTM C1609 Standard, to measure load versus mid-span deflection. Strength and toughness parameters are derived from the load–deflection data to assess the flexural performance of the FRC composite systems under consideration. The parameters of interest include first peak strength (pre-crack flexural strength) and post-crack residual strength and toughness provided by fiber addition. Of the mixtures tested, ARG fiber mixtures show the highest residual strength and toughness values, followed by PP and PVA fiber mixtures. ARG fibers produce the most workable mixtures at all fiber volumes, while PVA fibers show a tendency to encounter dispersion issues at higher volume doses. The outcome of this study is expected to facilitate the selection of fibers by giving insight into their relative contribution to fresh and hardened flexural properties of FRC.

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