Characterization of Discontinuous Fiber Reinforced Sheet Molding Compounds Under Tension-Tension Fatigue Load

2019 ◽  
Author(s):  
MIRIAM BARTKOWIAK ◽  
HANNES WEIT ◽  
JOHN MONTESANO ◽  
KAY ANDRÉ WEIDENMANN
Keyword(s):  
Fiber Reinforced ◽  
Fatigue Load ◽  
Molding Compounds ◽  
Discontinuous Fiber

scholarly journals Characterization of fiber matrix interface of continuous‐discontinuous fiber reinforced polymers on the microscale

PAMM ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Benedikt Rohrmüller ◽  
Michael Schober ◽  
Kerstin Dittmann ◽  
Peter Gumbsch ◽  
Jörg Hohe
Keyword(s):  
Fiber Reinforced Polymers ◽  
Matrix Interface ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Discontinuous Fiber ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

S042034 Fabrication of Discontinuous Fiber Reinforced Ceramic Composites and Characterization of Mechanical Properties

2011 ◽  
Vol 2011 (0) ◽  
pp. _S042034-1-_S042034-4
Author(s):  
Kosuke UMINO ◽  
Yusuke AKIYAMA ◽  
Shuichi WAKAYAMA ◽  
Takenobu SAKAI ◽  
Yuka UMEHARA ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ceramic Composites ◽  
Fiber Reinforced ◽  
Discontinuous Fiber

scholarly journals Testing Procedure for Fatigue Characterization of Steel-CFRP Hybrid Laminate Considering Material Dependent Self-Heating

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3394
Author(s):  
Selim Mrzljak ◽  
Stefan Schmidt ◽  
Andreas Kohl ◽  
Daniel Hülsbusch ◽  
Joachim Hausmann ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Testing Procedure ◽  
Fatigue Performance ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Fatigue Load ◽  
Reinforced Polymers ◽  
Self Heating ◽  
Hybrid Laminates

Combining carbon fiber reinforced polymers (CFRP) with steel offers the potential of utilizing the desired characteristics of both materials, such as specific strength/stiffness and fatigue strength of fiber reinforced polymers (FRP) and impact resistance of metals. Since in such hybrid laminates multiple material layers are combined, a gradual failure is likely that can lead to changes in mechanical properties. A failure of the metal partner leads to an increase in stress on the FRP, which under fatigue load results in increased self-heating of the FRP. Therefore, a suitable testing procedure is required and developed in this study, to enable a reproducible characterization of the mechanical properties under fatigue load. The resulting testing procedure, containing multiple frequency tests as well as load increase and constant amplitude tests, enabled characterization of the fatigue performance while never exceeding a testing induced change in temperature of 4 K. In addition to the development of the testing procedure, an insight into the manufacturing induced residual stresses occurring in such hybrid laminates, which impacts the load-bearing capacity, was established using finite element simulation. The gathered data and knowledge represents a basis for future in-depth investigations in the area of residual stress influence on the performance of hybrid laminates and highlights its importance, since not only the used testing procedure determines the measured fatigue performance.

Acoustic Emission Analysis during Bending Tests of Continuous and Discontinuous Fiber Reinforced Polymers to Be Used in Hybrid Sheet Molding Compounds

2017 ◽  
Vol 742 ◽  
pp. 644-651
Author(s):  
Anna Trauth ◽  
Pascal Pinter ◽  
Kay André Weidenmann
Keyword(s):  
Acoustic Emission ◽  
Failure Mechanisms ◽  
Machine Learning Algorithms ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Emission Analysis ◽  
Reinforced Polymers ◽  
Molding Compounds ◽  
Emission Signal ◽  
Discontinuous Fiber

Failure of fiber reinforced polymers is a complex interaction of different microstructural mechanisms. In order to assign those mechanisms to the macroscopic material response, in-situ methods as acoustic emission can be applied. This allows for the detection of initiation and growth as well as for the localization of damage in mechanically loaded materials. In this study, mechanical material testing of continuous and discontinuous fiber reinforced polymers was coupled with acoustic emission. Results have shown that different failure mechanisms resulting from different reinforcement architectures can be distinguished due to their acoustic emission signal. Based on experimentally captured acoustic emission signals, machine learning algorithms were applied to differentiate various failure mechanisms. This offers the possibility to investigate damage of hybrid continuous-discontinuous Sheet Molding Compounds exposed to bending loads.

Characterization of Fourth-Generation High-Temperature Discontinuous Fiber Molding Compounds

2009 ◽  
Vol 14 (7) ◽  
pp. 588-599
Author(s):  
Parakalan Krishnamachari ◽  
Jianzhong Lou ◽  
Jag Sankar ◽  
Jason E. Lincoln ◽  
Sara Hout
Keyword(s):  
High Temperature ◽  
Fourth Generation ◽  
Molding Compounds ◽  
Discontinuous Fiber

Mechanical and structural characterization of discontinuous fiber-reinforced dental resin composite

2016 ◽  
Vol 52 ◽  
pp. 70-78 ◽  
Author(s):  
Jasmina Bijelic-Donova ◽  
Sufyan Garoushi ◽  
Lippo V.J. Lassila ◽  
Filip Keulemans ◽  
Pekka K. Vallittu
Keyword(s):  
Structural Characterization ◽  
Resin Composite ◽  
Fiber Reinforced ◽  
Dental Resin ◽  
Discontinuous Fiber

TEM characterization of reaction zone in a SiC fiber-reinforced titanium alloy

1988 ◽  
Vol 46 ◽  
pp. 738-739
Author(s):  
G. Das ◽  
R. E. Omlor
Keyword(s):  
Titanium Alloys ◽  
Reaction Zone ◽  
Carbon Layer ◽  
Fiber Reinforced ◽  
Reaction Products ◽  
Sic Fibers ◽  
Sic Fiber ◽  
The Matrix ◽  
Immense Potential

Fiber reinforced titanium alloys hold immense potential for applications in the aerospace industry. However, chemical reaction between the fibers and the titanium alloys at fabrication temperatures leads to the formation of brittle reaction products which limits their development. In the present study, coated SiC fibers have been used to evaluate the effects of surface coating on the reaction zone in the SiC/IMI829 system.IMI829 (Ti-5.5A1-3.5Sn-3.0Zr-0.3Mo-1Nb-0.3Si), a near alpha alloy, in the form of PREP powder (-35 mesh), was used a茸 the matrix. CVD grown AVCO SCS-6 SiC fibers were used as discontinuous reinforcements. These fibers of 142μm diameter contained an overlayer with high Si/C ratio on top of an amorphous carbon layer, the thickness of the coating being ∽ 1μm. SCS-6 fibers, broken into ∽ 2mm lengths, were mixed with IMI829 powder (representing < 0.1vol%) and the mixture was consolidated by HIP'ing at 871°C/0. 28GPa/4h.

Characterization of interfaces in CVD-coated nicalon fiber-reinforced SiC

1989 ◽  
Vol 47 ◽  
pp. 556-557
Author(s):  
K.L. More ◽  
R.A. Lowden
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Frictional Stress ◽  
Fiber Reinforced ◽  
Pull Out ◽  
Carbon Coated ◽  
Fiber Matrix

The mechanical properties of fiber-reinforced composites are directly related to the nature of the fiber-matrix bond. Fracture toughness is improved when debonding, crack deflection, and fiber pull-out occur which in turn depend on a weak interfacial bond. The interfacial characteristics of fiber-reinforced ceramics can be altered by applying thin coatings to the fibers prior to composite fabrication. In a previous study, Lowden and co-workers coated Nicalon fibers (Nippon Carbon Company) with silicon and carbon prior to chemical vapor infiltration with SiC and determined the influence of interfacial frictional stress on fracture phenomena. They found that the silicon-coated Nicalon fiber-reinforced SiC had low flexure strengths and brittle fracture whereas the composites containing carbon coated fibers exhibited improved strength and fracture toughness. In this study, coatings of boron or BN were applied to Nicalon fibers via chemical vapor deposition (CVD) and the fibers were subsequently incorporated in a SiC matrix. The fiber-matrix interfaces were characterized using transmission and scanning electron microscopy (TEM and SEM). Mechanical properties were determined and compared to those obtained for uncoated Nicalon fiber-reinforced SiC.

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