2013 Timoshenko Medal Award Paper—Completion and Closure on Failure Criteria for Unidirectional Fiber Composite Materials

2013 ◽  
Vol 81 (1) ◽  
Author(s):  
Richard M. Christensen
Keyword(s):  
Composite Materials ◽  
Fiber Composite ◽  
Failure Criteria ◽  
Fiber Composites ◽  
Polynomial Invariants ◽  
Unidirectional Fiber ◽  
Detailed Evaluation ◽  
Unidirectional Fiber Composite ◽  
Failure Properties ◽  
Fiber Composite Materials

Building upon previous work, the failure criterion for unidirectional fiber composite materials is examined using a sensitivity analysis as applied to its transverse, matrix controlled failure properties. A new and general relationship is found between these three properties thereby reducing the total number of independent properties needed to calibrate the theory to five. This completes and closes the development of failure criteria for unidirectional fiber composites by the polynomial invariants method. A broad but detailed evaluation of the resulting failure criteria is given. Future applications for these new failure criteria are discussed.

Die-less Forming of Thermoplastic-Matrix Continuous Fiber Composite Materials—Process and Demonstration

1995 ◽  
Vol 117 (4) ◽  
pp. 501-507 ◽  
Author(s):  
K. Ramani ◽  
A. K. Miller ◽  
M. R. Cutkosky
Keyword(s):  
Composite Materials ◽  
Induction Heating ◽  
Fiber Composite ◽  
Fiber Composites ◽  
Uniform Heating ◽  
Continuous Fiber ◽  
Thermoplastic Matrix ◽  
Bending Behavior ◽  
Fiber Composite Materials ◽  
Heating Profile

Conventionally, large components made of thermoplastic matrices and continuous fibers are manufactured in autoclaves using dies. As the applications of composite materials increase, there is a need to reduce costs and increase manufacturing flexibility. This need has led to the development of a new concept called “die-less forming”. The concept of “kinematically admissible bending” is central to the concept of die-less forming. The concepts behind die-less forming have been tested in preliminary experiments on a two-roller demonstration machine. Induction heating was used to locally heat the composite as it moved into the forming zone, where it was bent using a specially designed cluster roller. Induction heating combined with a variable velocity profile was successful in establishing a uniform heating profile. Experiments were conducted for multidirectional APC-2 carbon/PEEK fiber composites and the composite bending behavior was explained using energy methods.

Current Research and Patents of Plant Fiber Composites

2019 ◽  
Vol 12 (1) ◽  
pp. 37-44
Author(s):  
Jiankang Wang ◽  
Zhijian Li ◽  
Hongwei Lu
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Fiber Composite ◽  
Fiber Composites ◽  
Living Environment ◽  
Processing Technology ◽  
Plant Fiber ◽  
Plant Fibers ◽  
Processing Properties ◽  
Fiber Composite Materials

Background: With the improvement of environment protection awareness, human beings have gradually become aware of that the plastic products, waste are harmful to the human living environment. Therefore, research and application of biodegradable materials that do not rely on petroleum resources have become hot topics. Researchers have accelerated the development and promotion of plant fiber because they are good flexibility, relatively rough surface and biodegradable. Objective: The development of plant fiber composites is reviewed, including composition ratio, interfacial modification, processing technology, and the effects of these technologies on the properties of plant fiber composites. Methods: The paper reviews various patents and research developments about plant fiber composite materials. It also analyzes the advantages and disadvantages of various patents and technologies from the aspects of biodegradable ability, mechanical properties, dispersing performance, processing properties, cost, and so on. Results: The component proportion, interface modification, and processing technology of plant fiber composite materials are prospected to improve the quality and application of the plant fiber composite materials in the future development. Conclusion: The considerable attention has been paid on the technology of biodegradable plant fiber composite. The recent patents and technologies have shown us a wider application in biodegradable plant fiber composite. The problems how to improve the mechanical properties of plant fibers, the dispersion properties of plant fibers and resins, and the processing properties of composite materials, will need more and more methods and equipment to solve or simplify.

Failure Theory/Failure Criteria for Fiber Composite Laminates

2016 ◽  
Vol 84 (2) ◽  
Author(s):  
Richard M. Christensen ◽  
Kuldeep Lonkar
Keyword(s):  
Composite Laminates ◽  
Fiber Composite ◽  
Failure Criteria ◽  
Fiber Composites ◽  
Failure Envelope ◽  
Related Matter ◽  
Failure Theory ◽  
Testing Data ◽  
Failure Properties ◽  
Theory Failure

Failure criteria are derived for the case of a quasi-isotropic laminate and for the more general case of orthotropic laminates. The former requires two calibrating failure properties obtained directly from laminate testing and the latter requires five standard experimental measurements for its calibration. Then the quasi-isotropic failure theory is taken much further, also admitting full calibration by only the two composites tow failure properties, the associated unidirectional tensile, and compressive strengths. The theoretically predicted failure envelope for the quasi-isotropic laminate is favorably compared with some comprehensive testing data. As a related matter, the general failure criteria for unidirectional fiber composites are also reviewed.

Applications of Carbon Fiber Composites

2011 ◽  
Vol 378-379 ◽  
pp. 121-124 ◽  
Author(s):  
Cheng Li Zhu
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Development Trends ◽  
New Applications ◽  
Fiber Composite Materials

Owing to the excellent properties, carbon fiber composites have been applied in many fields. This article outlined the new applications and development trends of carbon-fiber composite materials, and pointed out some problems existing in their development. Moreover, a new kind of billiard cloth made of the mixture of carbon fiber composites and wool was argued in the paper.

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