scholarly journals Effect of Low-Gamma Irradiation on the Impact Compressive Properties of Ultra High Molecular Weight Polyethylene and Its Constitutive Model

2008 ◽  
Vol 57 (9) ◽  
pp. 882-886
Author(s):  
Koichi KOBAYASHI ◽  
Makoto SAKAMOTO ◽  
Yuji TANABE
Keyword(s):  
Molecular Weight ◽  
Constitutive Model ◽  
Gamma Irradiation ◽  
High Molecular Weight ◽  
Compressive Properties ◽  
The Impact ◽  
Ultra High Molecular Weight

scholarly journals The Influence of the Use of Polymer Lining within the Roller Press Gravity Feeder on Briquette Quality

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2489
Author(s):  
Michał Bembenek
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Material Flow ◽  
Laboratory Tests ◽  
Polymer Materials ◽  
Roller Press ◽  
Fine Grained ◽  
The Impact ◽  
Ultra High Molecular Weight

When considering the operation of roller presses for the consolidation of fine-grained materials, the main problems are disturbances in the proper flow of the material and its bridging in gravity feeders. This is especially true for small and medium capacity presses, where the hoppers for dosing the material are narrow. This article presents innovative laboratory tests of the impact of using a polymer plate lining in the gravity feeder of a roller press. Polymer materials Polyacetal C (POM C) and Ultra-High-Molecular-Weight Polyethylene (UHMW-PE) were used for the tests. The influence of the use of plates on the material flow and quality of briquettes was investigated in comparison with the case where such plates were not used. The research showed an improvement in the flow of fine-grained materials in the feeder and an increase of the briquette strength indexes, as compared to those cases when polymer linings were not used in the feeder.

scholarly journals The low-velocity impact and post-impact properties of ultra-high-molecular-weight polyethylene fiber weft plain knitted structural composites

2019 ◽  
Vol 14 ◽  
pp. 155892501983252
Author(s):  
Cuiyu Li ◽  
Rui Zhang ◽  
Jingyan Jia ◽  
Gaopan Wang ◽  
Yameng Shi
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Contact Force ◽  
Compression Strength ◽  
Impact Compression ◽  
Impact Properties ◽  
Damage Area ◽  
Post Impact ◽  
The Impact ◽  
Ultra High Molecular Weight

This study investigated the impact and post-impact behavior of different layer weft plain knitted composite materials based on modified ultra-high-molecular-weight polyethylene/epoxy composites. The modified ultra-high-molecular-weight polyethylene weft plain knitted composites with 8, 12, 16 layers were prepared by vacuum-assisted resin transfer molding process and then subjected to impact and post-impact compression test. The impact properties were analyzed using the contact force–deflection and energy–time curves, and the post-impact compression was analyzed using the compression strength–strain curves. It can be obtained that the maximum contact force, absorbed energy, and residual compression strength after impact of the 16-layer specimen are 81.40%, 74.18%, and 73.25% more than those in the 8-layer specimen. respectively. According to the ultrasonic C-scan tests for the impact samples, the 16-layer specimen had the least damage area after the impact test, and the 8-layer composites damage area was 117.45% more than the 16-layer specimen.

scholarly journals Influence of Irradiation on Compressive Properties of Ultra-High Molecular Weight Polyethylene

2016 ◽  
Vol 80 (3) ◽  
pp. 192-196
Author(s):  
Masaru Kamiya ◽  
Hisao Kikugawa ◽  
Takashi Asaka ◽  
Masae Kanda ◽  
Yoshitake Nishi
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Compressive Properties ◽  
Ultra High Molecular Weight

scholarly journals Optimization of soft armor: the response of single-ply para-aramid and ultra-high molecular weight polyethylene fabrics under ballistic impact

2020 ◽  
Vol 90 (15-16) ◽  
pp. 1713-1729 ◽  
Author(s):  
Calvin Ralph ◽  
Lisa Baker ◽  
Edward Archer ◽  
Alistair McIlhagger
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Wave Velocity ◽  
Hybrid System ◽  
Transverse Wave ◽  
Ballistic Impact ◽  
Image Correlation ◽  
Factor C ◽  
The Impact ◽  
Ultra High Molecular Weight

Typical soft armor systems are constructed of multiple layers of a single fabric type. This empirical research sought to begin optimization of these systems through hybridization, sequencing dissimilar armor fabrics to maximize their ballistic protective performance, by first investigating single plies with a spectrum of properties to determine their behavior and response to impact. Eight individual plain weave fabrics with varying yarns and thread counts were manufactured from para-aramid and ultra-high molecular weight polyethylene (UHMWPE) yarns and physical and ballistic characterizations were conducted. The ballistic impact tests established the specific energy absorption (SEA) of each fabric across a range of impact velocities (340–620 m·s–1) and the transverse displacement wave velocity across the rear of the fabric was found using digital image correlation. Low cover factor ( Cfab) fabrics (0.74–0.84) consistently showed faster transverse wave speed than the high Cfab fabrics (0.84–0.96) for any given yarn type. The relative SEA of the fabrics varied dependent on both the impact velocity and number of plies impacted. It was found that lower Cfab fabrics had the highest SEA, critical velocity and transverse wave velocity. UHMWPE fabrics were not considered suitable for a woven hybrid system as they had a significantly lower SEA compared to all the para-aramid fabrics. Results indicate that a hybrid system, when considered as a theoretical spaced system, would benefit from higher Cfab fabrics as rearward layers. However, transverse wave results suggest the lower response of these fabrics may inhibit lower Cfab fabrics at the front of a combined hybridized system.

Influence of gamma-irradiation sterilization and temperature on the fracture toughness of ultra-high-molecular-weight polyethylene

Biomaterials ◽  
1997 ◽  
Vol 18 (10) ◽  
pp. 727-735 ◽  
Author(s):  
R.S. Pascaud ◽  
W.T. Evans ◽  
P.J.J. McCullagh ◽  
D.P. FitzPatrick
Keyword(s):  
Fracture Toughness ◽  
Molecular Weight ◽  
Gamma Irradiation ◽  
High Molecular Weight ◽  
Ultra High Molecular Weight
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