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.

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

Mechanical properties of fiber reinforced polymer composites: A comparative study of conventional and additive manufacturing methods

2018 ◽  
Vol 52 (23) ◽  
pp. 3173-3181 ◽  
Author(s):  
Kuldeep Agarwal ◽  
Suresh K Kuchipudi ◽  
Benoit Girard ◽  
Matthew Houser
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced Polymers ◽  
Manufacturing Processes ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Composite Filament

Fiber reinforced polymer composites have been around for many decades but recently their use has started to increase in multiple industries such as automotive, aerospace, and construction. The conventional composite manufacturing processes such as wet lay-up, resin transfer molding, automatic lay ups etc. suffer from a lot of practical and material issues which have limited their use. The mechanical properties of the parts produced by such processes also suffer from variation that causes problems downstream. Composites based additive manufacturing processes such as Fused Deposition Modeling and Composite Filament Fabrication are trying to remove some of the barriers to the use of composites. Additive manufacturing processes offer more design and material freedom than conventional composite manufacturing processes. This paper compares conventional composite processes for the manufacturing of Epoxy-Fiberglass fiber reinforced polymers with composite filament fabrication based Nylon-Fiberglass fiber reinforced polymers. Mechanical properties such as tensile strength, elastic modulus, and fatigue life are compared for the different processes. The effect of process parameters on these mechanical properties for the composite filament fabrication based process is also examined in this work. It is found that the composite filament fabrication based process is very versatile and the parts manufactured by this process can be used in various applications.

Experimental Characterization of the Fiber Angles of Multiple Curved Laminate Segments Using Prepreg-Based Carbon Fiber Reinforced Polymers as a Structure for a Non-Engaging Bellows Coupling

2019 ◽  
Vol 809 ◽  
pp. 555-562
Author(s):  
Christian Oblinger ◽  
André Baeten ◽  
Klaus Drechsler
Keyword(s):  
Carbon Fiber ◽  
Rotation Axis ◽  
Fiber Reinforced Polymers ◽  
Main Task ◽  
Experimental Characterization ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Carbon Fiber Reinforced

This paper deals with the experimental characterization of the fiber angles of multiple curved laminate segments using prepreg-based carbon fiber reinforced polymers as a structure for a non-engaging bellows coupling. The main task of this generic shaft coupling is the torsionally stiff torque transmission and the compensation of axial displacement as well as the angular misalignment of metallic shafts. The multiple curved structure can be manually draped by several cut segments using epoxy-based fabric prepreg. Moreover, the intended initial fiber orientation of the laminate is ±45° with respect to the rotation axis of the structure. For the experimental determination of the local fiber angles various CFRP cut segments were defined as CFRP specimens with varying number of layers and constant width. All investigations were based on cured CFRP specimens. The measurements were performed with a robot-assisted optical surface sensor and an optical digital microscope. The influence of the manual draping process according to the z-method could be quantitatively determined by the fiber angle measurements.

Mechanical properties and durability of unconfined and confined geopolymer concrete with fiber reinforced polymers exposed to sulfuric acid

2019 ◽  
Vol 215 ◽  
pp. 1015-1032 ◽  
Author(s):  
Radhwan Alzeebaree ◽  
Abdulkadir Çevik ◽  
Behzad Nematollahi ◽  
Jay Sanjayan ◽  
Alaa Mohammedameen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Sulfuric Acid ◽  
Fiber Reinforced Polymers ◽  
Geopolymer Concrete ◽  
Fiber Reinforced ◽  
Reinforced Polymers
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