The multiaxial behavior of filled polypropylene parts by drop-weight impact test

This study deals with the multiaxial behaviour of reinforced polypropylene with 30 % of glass fibre (PP30GF) and virgin polypropylene (PP). The impact behavior of these two materials is very needed to know for the possible modification of these two materials to obtain the better material properties. The injection moulded PP, and PP30GF samples were subjected to the penetration test at different set potential energies, and the results were subsequently evaluated and discussed. It was found out that PP has better behaviour at the multiaxial stress than PP30GF. It is possible to claim that for the application more demanding to the impact loading, pure PP is more suitable choice of the polymeric material.

Download Full-text

Investigation on Energy Absorption of Slab Foamed Concrete Reinforced by Polypropylene Fibre Subjected to Impact Loading

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.831.67 ◽

2013 ◽

Vol 831 ◽

pp. 67-72 ◽

Cited By ~ 2

Author(s):

Abdul Aziz Abdul Samad ◽

Josef Hadipramana ◽

Ahmad Zaidi Ahmad Mujahid ◽

Noridah Mohamad

Keyword(s):

Energy Absorption ◽

Impact Loading ◽

Impact Test ◽

Radial Crack ◽

Polypropylene Fibre ◽

Local Damage ◽

Foamed Concrete ◽

Porous Walls ◽

Weight Impact ◽

The Impact

Polypropylene Fibre (PF) as reinforcement has contributed to the intensity of Foamed Concrete (FC) slab when subjected to impact loading. The presence of PF in the admixture reduces the micro-porosity that generates the micro-crack of the slab. However, the fibrillation of PF in the admixture enhances the bonding mechanism system between PF and the FC matrix. The impact test conducted uses an instrumented drop-weight impact tower. Results show that FC without PF produces a distinct radial crack and clear fragments within the crater field unlike FC with PF. However, both slab materials did not generate spalling nor scabbing upon impact and the influence of porosity produces only local damage due to the mechanism of brittle crushing effect of porous walls. In this study, the energy absorption between FC with and without PF was investigated and from observation produces only minor differences. Results also verify that FC with PF did not loss its ability to absorb energy upon impact.

Download Full-text

Effect of Fibre Architecture on Impact Response of Glass-Aluminium Fibres Metal Laminates (FML)

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.a3039.109119 ◽

2019 ◽

Vol 9 (1) ◽

pp. 5639-5645

Keyword(s):

Glass Fibre ◽

Impact Load ◽

Peak Load ◽

Matrix Cracking ◽

Impact Behavior ◽

Drop Weight ◽

Glass Fibre Reinforced Polymer ◽

Glass Fibre Reinforced ◽

Weight Impact ◽

The Impact

This paper investigates the drop weight impact behavior of glass fibre-aluminum (GFRP-AL FML) composites. The purpose of the research is to study the effect of different type of glass fibres architecture, i.e woven and unidirectional, with existence Al sheet in the middle of the glass fibre reinforced polymer composites (GFRP). The impact behaviour of these GFRP and GFRP-AL FMLs was investigated using a drop-weight impact tower at three different energy level, which are 10J, 20J and 30J. The Load - deflection curves were used to measure the absorbed energy. The results showed that the woven type of GFRP exhibited the highest peak load but lowest deflection thus reducing the total energy absorbed. In contrast, the unidirectional types of GFRP possessed the lowest peak load and highest deflection, which results in the highest energy absorbed. For the GFRP-AL FML composites, the energy absorbed obtained almost similar for both woven and unidirectional types. This is may be due to poor adhesion between the GFRP and Al sheet, thus make both materials separated and delaminated when subjected to impact load. The optical analysis proved that the GFRP-AL debonding, fibres breakage, fibres delamination and matrix cracking occurred during the impact loading. These are the main impact energy –absorption mechanisms involved during the test.

Download Full-text

SIMULATION OF DYNAMIC EVENT OF IMPACT USING EXPLICIT 3D FEM MODEL AND VALIDATION BY EXPERIMENT AND CONTACT MODELS

International Journal of Engineering Applied Sciences and Technology ◽

10.33564/ijeast.2021.v06i03.007 ◽

2021 ◽

Vol 6 (3) ◽

Author(s):

Akshay Mallikarjuna ◽

Dan Marghitu ◽

P.K. Raju

Keyword(s):

Material Properties ◽

Permanent Deformation ◽

Oblique Impact ◽

Coefficient Of Restitution ◽

Impact Behavior ◽

3D Fem ◽

Dynamic Event ◽

Contact Models ◽

Explicit Dynamic ◽

The Impact

— In this study, an optimized method to simulate the dynamic 3D event of the impact of a rod with a flat surface has been presented. Unlike the 2D FEM based contact models, in this study both the bodies undergoing the impact are considered elastic(deformable) and simulation is the dynamic event of the impact, instead of predefined 2D symmetric contact analysis. Prominent contact models and plasticity models to define material properties in ANSYS are reviewed. Experimentation results of normal and oblique impact of the rod for different rods provided the coefficient of restitution. Experimental results of permanent deformation on the base for different impact velocity is derived out of a prominent impact study. The simulation results are in co-relation with experiment and both indentation and flattening models on the coefficient of restitution (COR) and permanent deformation of the base and rod after the impact. Thus, the presented 3D Explicit Dynamic simulation of impact is validated to analyze the impact behavior of the 2 bodies without any predefined assumptions with respect to boundary conditions or material properties.

Download Full-text

The Effect of Layers and Bullet Type on Impact Properties of Glass Fibre Reinforced Polymer (GFRP) Using a Single Stage Gas Gun (SSGG)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.564.428 ◽

2014 ◽

Vol 564 ◽

pp. 428-433 ◽

Cited By ~ 3

Author(s):

S.N.A. Safri ◽

Mohamed Thariq Hameed Sultan ◽

N. Razali ◽

Shahnor Basri ◽

Noorfaizal Yidris ◽

...

Keyword(s):

Impact Energy ◽

Glass Fibre ◽

Impact Test ◽

Single Stage ◽

Gas Gun ◽

Reinforced Polymer ◽

Glass Fibre Reinforced Polymer ◽

Fibre Reinforced Polymer ◽

Glass Fibre Reinforced ◽

The Impact

The purpose of this work is to study the best number of layer with the higher impact energy using Glass Fibre Reinforced Polymer (GFRP). The number of layers used in this study was 25, 33, 41, and 49. The impact test was performed using Single Stage Gas Gun (SSGG) for each layers given above with different bullets such as blunt, hemispherical and conical bullets. The gas gun pressure was set to 5, 10, 15 and 20 bar. All of the signals captured from the impact test were recorded using a ballistic data acquisition system. The correlation between the impact energy in terms of number of layer and type of bullet from this test are presented and discussed. It can be summarise that as the number of layer increases, impact energy also increases. In addition, from the results, it was observed that by using different types of bullets (blunt, hemispherical, conical), there is only a slight difference in values of energy absorbed by the specimen.

Download Full-text

Impact Test for the Leading Edge of CMC Vane Based on Actual Aircraft Engine Field Data

Volume 6: Ceramics; Controls, Diagnostics, and Instrumentation; Education; Manufacturing Materials and Metallurgy ◽

10.1115/gt2018-76116 ◽

2018 ◽

Author(s):

Kenro Obuchi ◽

Fumiaki Watanabe ◽

Hiroshi Kuroki ◽

Hiroyuki Yagi ◽

Kazuyoshi Arai

Keyword(s):

Impact Test ◽

Impact Resistance ◽

Leading Edge ◽

Aircraft Engine ◽

Aircraft Engines ◽

Turbine Vanes ◽

Turbine Vane ◽

Nickel Based Alloy ◽

Weight Impact ◽

The Impact

Ceramic matrix composites (CMCs) have lower density and a higher service temperature limit than nickel based alloys which have been used for turbine components of aircraft engines. These properties of CMCs have the potential to reduce the weight of turbine components and improve turbine thermal efficiency with a higher turbine inlet temperature (TIT). One of the technical issues of the CMC turbine vane is a relatively lower impact resistance than nickel based alloy turbine vanes. There are various previous works about impact resistance of CMCs, but there is little work that assumed actual engine conditions. The objective of this work was to verify the resistance of SiC/SiC CMC turbine vane to the impact phenomena that occur in the actual aircraft engine. The field damage survey was conducted on actual metal turbine vanes of commercial engines overhauled in IHI. The survey made it clear that the typical damage was less-than-0.127-mm-dent at the leading edge. In addition, the dropped weight impact test using the actual turbine airfoil which is made from a nickel based alloy was conducted at ambient temperature. The amount of energy required to make the dent of a certain size that was observed in actual metal turbine vanes was estimated. Then, the dropped weight impact test using the CMC test piece with a leading edge shape was conducted at the impact energy estimated by the metal turbine airfoil. The results showed that the failure mode of the CMC test piece was local damage with dents of a certain size and not a catastrophic failure mode. From this work, the damage to be assumed on CMC vane in actual aircraft engines was identified. As a future task, the effect of the damage to the fatigue capability of CMC turbine vanes needs to be investigated.

Download Full-text

The effect of microwave pretreatment on impact crushing of lead-zinc ore

Metallurgical Research & Technology ◽

10.1051/metal/2021055 ◽

2021 ◽

Vol 118 (5) ◽

pp. 501

Author(s):

Yulong Liu ◽

Dexin Ding ◽

Wenguang Chen ◽

Nan Hu ◽

Lingling Wu ◽

...

Keyword(s):

Energy Input ◽

Impact Test ◽

Characteristic Parameters ◽

Microwave Pretreatment ◽

Drop Weight ◽

Lead Zinc ◽

Weight Impact ◽

Impact Crushing ◽

The Impact ◽

The Relationship

The relationship between energy input and particle size of ore samples after crushing and effect of microwave pretreatment on impact crushing of lead-zinc ore were studied by drop weight impact test. The results showed that the lead-zinc ore became softer and had higher degree of crushing after microwave pretreatment. Compared with continuous microwave pretreatment, pulsed microwave pretreatment could improve the drop weight impact crushing efficiency of lead-zinc ore. When the specific comminution energy were 5 kW h/t, 10 kW h/t respectively, the crushing characteristic parameters t10 were 60.42% and 67.46% respectively by continuous microwave. But the values of t10 were increased to 68.64% and 75.88% respectively after pulsed microwave radiation under same microwave power and time. In addition, water quenching could more promote the impact crushing efficiency of lead-zinc ore after microwave irradiation.

Download Full-text

Influence of Hybridisation and Test Geometry on the Impact Response of Glass-Fibre-Reinforced Laminated Composites

Polymers and Polymer Composites ◽

10.1177/096739110201000401 ◽

2002 ◽

Vol 10 (4) ◽

pp. 259-272 ◽

Cited By ~ 2

Author(s):

Bernard Schrauwen ◽

Pascal Bertens ◽

Ton Peijs

Keyword(s):

Glass Fibre ◽

Test Set ◽

Impact Behaviour ◽

Impact Tests ◽

Hybrid Laminates ◽

Glass Fibre Reinforced ◽

Weight Impact ◽

Set Up ◽

Falling Weight ◽

The Impact

This paper describes the results of falling weight impact tests (FWITs) on glass-fibre-reinforced (GRP) laminates and E-glass/Dyneema® hybrid laminates. The test programme consisted of (i) falling weight impact tests to determine the penetration energy and (ii) experiments to determine the influence of hybrid construction on damage development and impact fatigue lifetime under repeated impact conditions at sub-penetration energy levels. The objective of this work was to investigate the effect of hybridisation on the impact behaviour of GRP laminates as well as to find optimal conditions for hybridisation. It was shown that in the case of a rigid test set-up - and hence small deflections - the influence of the Dyneema® on the impact behaviour of hybrid laminates is rather small because damage processes are the result of local contact stresses in the vicinity of the impact body, whereas in the case of a compliant test set-up and large deflections the high energy storage capacity of the ductile Dyneema® fibres is used far more effectively for the protection of hybrid composite laminates. Therefore, it was concluded that in order to fully utilise the potential of high-performance polyethylene fibres it is essential that these fibres are located on the (non-impacted) tensile side of an impacted laminate and that the geometrical test conditions are such that large (bending) deformations are allowed.

Download Full-text

Experimental Investigation on the Impact Resistance of Carbon Fibers Reinforced Coral Concrete

Materials ◽

10.3390/ma12234000 ◽

2019 ◽

Vol 12 (23) ◽

pp. 4000 ◽

Cited By ~ 2

Author(s):

Bing Liu ◽

Jingkai Zhou ◽

Xiaoyan Wen ◽

Jianhua Guo ◽

Xuanyu Zhang ◽

...

Keyword(s):

Weibull Distribution ◽

Carbon Fibers ◽

Impact Test ◽

Concrete Strength ◽

Impact Resistance ◽

Initial Crack ◽

Drop Weight ◽

Weight Impact ◽

The Impact ◽

Two Parameter

In this study, the impact resistance of coral concrete with different carbon fiber (CF) dosages subjected to drop-weight impact test was investigated. For this purpose, three concrete strength grades (C20, C30, C40) and six CF dosages (0.0%, 0.3%, 0.6%, 1.0%, 1.5%, and 2.0% by weight of the binder) were considered, and a total of 18 groups of carbon fibers reinforced coral concrete (CFRCC) were cast. For each group, eight specimens were tested following the drop-weight impact test suggested by CECS 13. Then, the two-parameter Weibull distribution theory was adopted to statistically analyze the variations in experimental results. The results indicated that the addition of CFs could transform the failure pattern from obvious brittleness to relatively good ductility and improve the impact resistance of coral concrete. Moreover, the impact resistance of CFRCC increases with the CF dosage increasing. The statistical analysis showed that the probability distribution of the blow numbers at the initial crack and final failure of CFRCC approximately follows the two-parameter Weibull distribution.

Download Full-text

Numerical Analysis of Impact Velocity on the Responses of Adhesively Bonded Steel Butt Joint with Material Properties

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.644.193 ◽

2013 ◽

Vol 644 ◽

pp. 193-196 ◽

Cited By ~ 1

Author(s):

Min You ◽

Kai Liu ◽

Hai Zhou Yu ◽

Ling Wu ◽

Mei Li

Keyword(s):

Impact Velocity ◽

Material Properties ◽

Impact Test ◽

Failure Time ◽

Butt Joint ◽

The Finite Element Method ◽

Adhesively Bonded ◽

Izod Impact ◽

The Impact ◽

Peak Value

The effect of the impact velocity on the responses of the adhesively bonded steel butt joint during Izod impact test and the failure procedure is studied using the finite element method software ABAQUS. The results obtained show that the failure time of the element becomes little shorter when the impact velocity increased from 3.2 m/s to 10.2 m/s. The peak value of the Seqv in element 1 increases first and then decreased when the impact velocity reached 4.2 m/s. When the impact velocity is higher than 6.2 m/s, the peak value of the Seqv increased again as the impact velocity increased until 10.2 m/s. It is recommended that the impact velocity of 3.2 m/s or 5.2 m/s is suitable for Izod impact test for the adhesively bonded steel butt joint.

Download Full-text