Calibration of the material parameters of a CFRP laminate for numerical simulations

2019 ◽  
Vol 54 (17) ◽  
pp. 2313-2326
Author(s):  
A Gilioli ◽  
A Manes ◽  
M Giglio
Keyword(s):  
Tensile Test ◽  
Element Model ◽  
Tensile Tests ◽  
Bending Test ◽  
Three Point Bending ◽  
Reinforced Plastic ◽  
Short Beam ◽  
Explicit Solver ◽  
Carbon Fibre Reinforced Plastic ◽  
Stress Patterns

The aim of present paper is to show a procedure to calibrate mechanical properties to be used in a finite element model for a carbon fibre-reinforced plastic laminate that use solid elements. A reduced experimental programme including tensile test, tensile test on specimen with a central hole, three-point bending test and three-point bending test on short beam test were carried out. Every test was numerically reproduced by means of an explicit solver. Properties are determined from the tensile test and unmodified for the other load scenarios which are used as validation benchmarks. Finally, it is demonstrated that the properties determined with the simple tensile tests can guarantee accurate results when adopted to simulate much more complicated stress patterns.

Assessment of Fracture Toughness Using Small Punch Tests of Prenotched Specimens

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Yangyan Zheng ◽  
Xiao Chen ◽  
Zheng Yang ◽  
Xiang Ling
Keyword(s):  
Fracture Toughness ◽  
Numerical Simulations ◽  
Stress Gradient ◽  
Element Model ◽  
Bending Test ◽  
J Integral ◽  
Notched Specimen ◽  
Small Punch ◽  
Three Point Bending ◽  
The Difference

In this paper, line- and ring-notched small punch test (SPT) specimens were studied; a three-dimensional (3D) model of a ring-notched SPT specimen was established using the contour integral method, and the validity of the model was verified using ring-notched specimens. The stress and strain fields were analyzed using numerical simulations of a ring-notched SPT specimen, and the change in the stress gradient during deformation was considered. To verify the finite element model, the results of the numerical simulations were compared with those of three-point bending tests and a Gurson–Tvergaard–Needleman (GTN) model. Compared with the line-notched specimen, the ring-notched specimen was more suitable for notch propagation analysis and fracture toughness evaluation. The results of the numerical simulations were in good agreement with those of the experiments, which showed that the numerical model used in this study was correct. For a notch that initiated when the load reached its maximum value, the value of the J integral was 335 × 10−6 kJ/mm2, and at time 0.85Pmax, the value of the J integral was 201 × 10−6 kJ/mm2, and the difference from the result of the three-point bending test was 14.4%. For a notch that initiated during the stretching deformation stage, the relevant fracture toughness was 225 × 10−6 kJ/mm2, and the difference from the result of the three-point bending test was 3%.

scholarly journals Short Beam Three Point Bending Test on Hot-Dip Aluminized SUS316 Stainless Steel

1994 ◽  
Vol 58 (2) ◽  
pp. 242-243
Author(s):  
Yasuhiro Shinkai ◽  
Tadakazu Ohnishi ◽  
Masatoshi Nishiyama
Keyword(s):  
Stainless Steel ◽  
Bending Test ◽  
Three Point Bending ◽  
Short Beam

Mechanical Characterization of Friction Stir Welds of Two Dissimilar Aluminium Alloys of the 6xxx Series

2008 ◽  
Vol 587-588 ◽  
pp. 430-434 ◽  
Author(s):  
Pedro Miguel Guimarães Pires Moreira ◽  
T. Santos ◽  
Sérgio M.O. Tavares ◽  
Valentin Richter-Trummer ◽  
Pedro Vilaça ◽  
...  
Keyword(s):  
Aluminium Alloys ◽  
Mechanical Characterization ◽  
Element Model ◽  
Tensile Tests ◽  
Strength Properties ◽  
Bending Test ◽  
Friction Stir ◽  
Microstructure Examination ◽  
6Xxx Series

A study on the mechanical characterization of friction stir welds between aluminium alloys 6061-T6 and 6082-T6 was carried out. For comparison, single alloy joints made from each one of the two alloys were also performed. The work included microstructure examination, microhardness tests, tensile tests and bending tests of all joint types. An approximate finite element model of the joint, taking into account the spatial dependence of the tensile strength properties, was made, modelling a bending test of the weldments.

scholarly journals Mechanical Properties of Layered-Carbon Fiber Reinforced with Vacuum Infusion Process

2021 ◽  
Vol 6 (1) ◽  
pp. 33-40
Author(s):  
Ali Saifullah ◽  
Mohammad Jufri ◽  
Dini Kurniawati ◽  
Risky Chandra
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Tensile Test ◽  
Tensile Tests ◽  
Fiber Composites ◽  
Bending Test ◽  
Carbon Fiber Composites ◽  
Fiber Reinforced ◽  
Vacuum Infusion ◽  
Carbon Fiber Reinforced

Research on material engineering is widely developed in the precursors, composition of the material, and technique to create a composite. The layering and vacuum infusion resin are the developing technology to create the composites with the new characteristics and properties. This experiment is intended to find out the characteristics of layering carbon fiber reinforced by resin and is molded with vacuum infusion technique. The specimens of this experiment is layered-carbon fiber composites determined in three, four, five, six, and seven layers. The precursors of 220 and 240 carbon fibers are the main material of the composites. The tests conducted to the specimens are bending and tensile tests. The both tests are treated to reveal the mechanical properties of the composites. The least layers of 220 and 240 carbon fiber result the highest value of bending test, but the most number of carbon fiber layers show the opposite value. The results are reverse in the tensile test. The highest value of the tensile test is achieved by the most layers of carbon fiber, while the lowest value is in the least layers. This result is almost the same with the strain-stress, but overall the graphic is similarly increase to the most layers. Deduction achieved in this experiment is that the number of layers in the carbon fiber composites is significantly influencing the mechanical properties of the composite.

Environmental Effect on Short-Beam Composite under Three-Point Bending Test

2017 ◽  
Vol 740 ◽  
pp. 17-24
Author(s):  
Majid Mariam ◽  
M. Afendi ◽  
M.S. Abdul Majid
Keyword(s):  
Glass Fiber ◽  
Room Temperature ◽  
Fiber Reinforced Polymer ◽  
Bending Test ◽  
Glass Fiber Reinforced Polymer ◽  
Three Point Bending ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Short Beam ◽  
Wet Condition

The effect of moisture, water absorption on a single short span beam of glass fiber reinforced polymer (GFRP) was examined under room temperature, 27°c. The aim of the study is to investigate the mechanical properties of composite under wet condition. The composite were cut into rectangular shape with a dimension of 78 mm long, 26 mm width and 3.5 mm depth. The moisture content of eight specimens was experimentally reduced as the glass fiber content increased. In this investigation, the flexural strength and modulus of composites were determined throughout the three-point bending test. The specimens were rigged up horizontally as supported beams and loaded vertically at the geometric center. Thus, the results were developed into loading versus deflection and relationship for each specimen. The samples were considered to have failed when the curves were in steady decline section. Failure mechanisms were observed in categories; face yield, core yield and fiber tear.

The Mechanical Behavior of the Hybrid FRP Beam

2011 ◽  
Vol 365 ◽  
pp. 119-124 ◽  
Author(s):  
Yeou Fong Li ◽  
Shu Ting Kan
Keyword(s):  
Failure Mode ◽  
Bending Test ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Glass Fiber Reinforced Plastic ◽  
Three Point Bending ◽  
Fiber Reinforced Plastic ◽  
Glass Fiber Reinforced ◽  
Reinforced Plastic ◽  
Force Displacement

This paper presents the mechanical behaviors of hybrid fiber reinforced plastic (HFRP) composite beams. There are two methods were proposed to increase the stiffness of pultruded glass fiber reinforced plastic (GFRP) beam and change the failure mode. The first method is to infill the epoxy mortar into the GFRP beam. The second method is hand layout the GFRP beam by using carbon fiber with different direction fibers to increase the stiffness of the GFRP beam. Three-point bending test was conducted to obtain the force-displacement relationship, stiffness, failure strength and failure mode of the GFRP beams. The test results show that the stiffness of GFRP beam filled with epoxy mortar is twice larger than GFRP beam.

scholarly journals Effect of the Number of CFRP Prepregs and Roughness at the Bonding Area on the Spring-Back and Flexural Strength of Hybrid Composites of CFRP Combined with CR980

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1054
Author(s):  
Ji Hoon Hwang ◽  
Chul Kyu Jin ◽  
Hyung Yoon Seo ◽  
Chung Gil Kang
Keyword(s):  
Flexural Strength ◽  
Hybrid Composites ◽  
Metal Plate ◽  
Bending Test ◽  
Carbon Fiber Reinforced Plastic ◽  
Spring Back ◽  
Three Point Bending ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Bonding Area

Hybrid composites in which a CR980 metal plate was bonded on carbon-fiber-reinforced plastic (CFRP) were prepared. Hybrid composites were two types of CFRP/CR980 hybrid composites and CR980/CFRP hybrid composites. The properties of the hybrid composites according to surface roughness on CR980 plate and the laminating number of CFRP prepregs were analyzed. The spring-back or spring-go angles were also measured through the V-bending test of hybrid composites. In addition, a three-point bending test for the hybrid composites was conducted to measure the flexural strength. Spring-back occurred in the CFRP/CR980 hybrid composites, while spring-go was observed in the CR980/CFRP hybrid composites. Voids were not found at the bonding area of the CFRP and CR980. As the roughness at the bonding area increased, the flexural strength slightly increased. The higher the laminating number of the CFRP prepregs, the lower the deformation value. CFRP/CR980 was deformed more easily than CR980/CFRP.

Research on the Crack Detection of Subway Station Double-Layer Framework Structure Based on ANSYS

2014 ◽  
Vol 1049-1050 ◽  
pp. 413-415
Author(s):  
Jing Min Gong ◽  
Juan Ma
Keyword(s):  
Finite Element ◽  
Structural Damage ◽  
Crack Detection ◽  
Element Model ◽  
Bending Test ◽  
Simulation Test ◽  
Coupling Field ◽  
Mechanical Coupling ◽  
Three Point Bending ◽  
Modeling Theory

By introducing the basic theory of finite element method and commercial software ANSYS, the coupling field modeling theory, according to the structure of three point bending test to establish the finite element model for the electric and mechanical coupling field simulation test structure. At the same time, with the change of load structure deformation, due to smart layer piezoresistive effect, its potential changes, which can be implemented using intelligent layer resistivity changes of structural damage detection and monitoring.

A study on mechanical properties of Al5052/CFRP/Al5052 composite through three-point bending tests and shear lap tests according to surface roughness

2016 ◽  
Vol 54 (12) ◽  
pp. 1549-1559 ◽  
Author(s):  
MS Lee ◽  
SJ Kim ◽  
OD Lim ◽  
CG Kang
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Bending Test ◽  
Shear Load ◽  
Side View ◽  
Bending Tests ◽  
Three Point Bending ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Hybrid Sample

In this study, aluminum samples with various microsurface roughness values were produced by sandblasting to investigate the effect of the Ra (Surface roughness) value on the samples’ mechanical properties. Toward this end, a carbon fiber reinforced plastic/Al5052 hybrid sample was produced, and its mechanical properties were investigated through a tensile test, three-point bending test, and shear lap test. The theoretical and experimental tensile strength values of the hybrid composite were compared. During the bending test, CFRP and AI5052 separated in untreated specimens. A side-view examination revealed that the adhesion was best when the surface roughness was greatest ( Ra = 1.2 µm). Furthermore, shear load increased with the surface roughness. Therefore, the surface treatment was a crucial factor in making the specimen surface even and in increasing the roughness and therefore improving adhesion.

Concept for a Bistable Composite Twisting Structure

2011 ◽  
Author(s):  
Xavier Lachenal ◽  
Stephen Daynes ◽  
Paul Weaver
Keyword(s):  
Strain Energy ◽  
Energy Levels ◽  
Bending Moment ◽  
Vertical Axis ◽  
Element Model ◽  
Torsional Stiffness ◽  
Design Parameters ◽  
Reinforced Plastic ◽  
Potential Applications ◽  
Carbon Fibre Reinforced Plastic

A novel type of morphing twisting structure capable of large deformations is investigated. The structure consists of two flanges subject to a uniform distributed bending moment along their length and joined to introduce two stable twisted configurations. These equilibria are positioned symmetrically with regards to the vertical axis of the device and the structure can be twisted between these configurations by a snap-through action. By tailoring the design parameters of the structure, different twist angles and snap-through moments can be achieved. An analytical model and finite element model (FEM) are presented. A prototype made of carbon-fibre reinforced plastic (CFRP) was manufactured and tested. Agreement in terms of angle of twist, axial force and stiffness is found. Moreover, comparison between the two models confirms their validity in terms of snap-through moment, torsional stiffness and strain energy levels. The influence of the lay-up employed and design parameter is also investigated. Potential applications include deployable and morphing structures.

Sign in / Sign up

Export Citation Format

Share Document