Fiber symmetry

This chapter develops the general constitutive equation for transversely isotropic, fiber-reinforced materials. Applications include composite materials and bio-elasticity.

Case Study of Consolidation Methods with Fiber-Based Composite Materials in Romania

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.747.414 ◽

2017 ◽

Vol 747 ◽

pp. 414-419

Author(s):

Iasmina Apostol ◽

Rares Bradeanu ◽

Marius Mosoarca

Keyword(s):

Composite Materials ◽

Composite Fiber ◽

Cultural Value ◽

Masonry Buildings ◽

Fiber Reinforced ◽

Made In ◽

Romania is a country divided in two important seismic areas, with a history that has as proof buildings with historical and cultural value, most of them made in masonry. A large number of those buildings have suffered damages because of earthquakes, subsidence of foundations or lack of interventions. In this article will be presented some consolidation methods applied on masonry buildings in Romania, with composite fiber-reinforced materials, made by Kerakoll producer. Those modern consolidation solutions that were used in Romania may represent examples that can represent the base of choosing the consolidation methods for other buildings with similar damages.

Delamination Models in Drilling of Composite Materials Using Saw Drill and Candle-Stick Drill

10.1115/imece2001/med-23308 ◽

2001 ◽

Author(s):

H. Ho-Cheng ◽

C. C. Tsao

Keyword(s):

Composite Materials ◽

Thrust Force ◽

Practical Experience ◽

Twist Drill ◽

Fiber Reinforced ◽

Critical Thrust Force ◽

Drill Design ◽

Abstract Drilling is the most frequently employed operation of secondary machining for fiber-reinforced materials owing to the need for structure joining. Delamination is one of the serious concerns during drilling. Practical experience proves the advantage of using such special drills as saw drill and candle stick drill. Comprehensive delamination models for twist drill, saw drill and candle stick drill in drilling of composite materials are constructed in the present study. Of the three, the saw drill offers the highest critical thrust force followed by the candle stick drill, while the traditional twist drill allows for the lowest thrust force. A guide for drill design can be developed based on the proposed models.

The research on precise forming technology of “λ” type composite skin

Composites and Advanced Materials ◽

10.1177/2634983321994749 ◽

2021 ◽

Vol 30 ◽

pp. 263498332199474

Author(s):

Qiang Guo ◽

Kai He ◽

Hengyuan Xu ◽

Youyi Wen

Keyword(s):

Carbon Fiber ◽

Middle Layer ◽

Fiber Reinforced ◽

Process Verification ◽

Forming Technology ◽

New Type ◽

Carbon Fiber Reinforced ◽

Type Composite ◽

With the application of “ λ” type composite skin becoming more and more extensive and diversified, its precise forming technology is also widely concerned. This article mainly solves the quality problems of “ λ” type corner area, such as delamination dispersion and surface wrinkle, which exist in reality commonly in the manufacturing process. The prepreg is heated along the corner area of the tooling to solve the problem that prepreg is difficult to be compacted due to the large modulus of carbon fiber in “ λ” type corner area. Furthermore, two precompaction tests are creatively increased at 16 layers (middle layer) and 32 layers (last layer) for the thick structure, respectively, to ensure the compaction effect of the blank. In addition, combined with the characteristics of highly elastic rubber and carbon fiber-reinforced materials, a new type of soft mold structure with proper flexibility and good stiffness is proposed innovatively through the reasonable placement of carbon fiber-reinforced materials and the setting of exhaust holes according to the structure characteristics of “ λ” type root skin. Through further process verification, it is shown that the improved process has effectively solved the problems of wrinkles and internal delamination at the sharp corners of parts and realized zero-defect manufacturing of “ λ” type root skin for the first time.