Influence of Specimen-Absorbed Energy in Lox Mechanical-Impact Tests

2009 ◽  
pp. 381-381-18 ◽  
Author(s):  
RP Reed ◽  
NJ Simon ◽  
JR Berger ◽  
JD McColskey
Keyword(s):  
Absorbed Energy ◽  
Mechanical Impact ◽  
Impact Tests

Development and characterization of structural adhesives for aerospace industry with alumina nanoparticles under shear and thermo-mechanical impact loads

2019 ◽  
Vol 234 (2) ◽  
pp. 490-507 ◽  
Author(s):  
UA Khashaba ◽  
Ramzi Othman ◽  
Ismael MR Najjar
Keyword(s):  
Contact Force ◽  
Bending Stiffness ◽  
Alumina Nanoparticles ◽  
Absorbed Energy ◽  
Impact Machine ◽  
Impact Properties ◽  
Weight Percentage ◽  
Mechanical Impact ◽  
Impact Bending ◽  
The Impact

The present work aims to improve the mechanical properties of Epocast 50-A1/946 epoxy via incorporation of alumina nanoparticles using an ultrasonic agitation method. The optimum weight percentage of alumina nanoparticles was determined based on the improvement in the shear and impact properties of the nanocomposites at room temperature and 50 ℃. Accordingly, neat epoxy panels and nanocomposite panels with 0.5, 1.0, 1.5, and 2.0 wt% alumina nanoparticles were fabricated. The shear and thermo-mechanical impact properties of the panels were measured using an instrumented drop-weight impact machine and an Iosipescu shear test fixture, respectively, according to ASTMs D5379 and D7136. The maximum improvement in shear strength and modulus was 10.9% and 8.1%, respectively, for the nanocomposites containing 1.0 and 1.5 wt% alumina nanoparticles. The predicted shear moduli of the nanocomposites agreed well with the measured values with a maximum error of 6.52%. The optimal performance of impact properties was achieved by incorporating 1.0 wt% of alumina nanoparticles. Namely, the maximum impact-bending stiffness, contact force, and absorbed energy were increased by 12.9%, 13.0%, and 23.4%, respectively. The test temperature of 50 ℃ was found to have a negative effect on the impact-bending stiffness and the maximum contact force. On the other hand, the absorbed energy was increased up to 12.1%.

Fracture toughness and absorbed energy measurements in impact tests on brittle materials

1973 ◽  
Vol 8 (7) ◽  
pp. 949-956 ◽  
Author(s):  
G. P. Marshall ◽  
J. G. Williams ◽  
C. E. Turner
Keyword(s):  
Fracture Toughness ◽  
Brittle Materials ◽  
Absorbed Energy ◽  
Impact Tests

Evaluation of Bending Limit of 9Cr-1Mo-V Steel by Master Curve and Failure Assessment Diagram Method: Evaluation of Welded Metal

2018 ◽  
Author(s):  
Mitsuyoshi Nakatani ◽  
Kazuo Oda ◽  
Tomohiro Tanaka ◽  
Masamitsu Abe ◽  
Yasuhito Takashima ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Master Curve ◽  
Postweld Heat Treatment ◽  
Charpy Impact ◽  
Fracture Probability ◽  
Absorbed Energy ◽  
Diagram Method ◽  
Impact Tests ◽  
Master Curve Method ◽  
Bending Process

In this study, the bending and rolling limit of 9Cr-1Mo-V steel plate welded using submerged arc welding (SAW) was investigated. Hereafter in this report, the bending limit refers to bending by press or by roller. Since heat treatment after welding and before the bending process may be effective in preventing brittle fracture during bending, the effect of postweld heat treatment (PWHT) for improving toughness was evaluated by Larson-Miller parameter (LMP). Charpy impact tests of SAW welded parts made of 9Cr-1Mo-V steel plates were performed, and the absorbed energy of the weld metal was lower than that of the heat affected zone (HAZ) and the base metal, however the absorbed energy was recovered by PWHT. The absorbed energy increased as LMP increased. The reference temperature T0 for the master curve method was estimated by the results of Charpy impact tests. The bending limit was estimated by the method proposed in the previous study. The fracture probability during the bending process seems to decrease as LMP increases.

scholarly journals Influence of Machine Anvil Wear on Charpy Test Results

2020 ◽  
Vol 125 ◽  
Author(s):  
Enrico Lucon ◽  
Raymond L. Santoyo
Keyword(s):  
Energy Levels ◽  
The State ◽  
The Other ◽  
Test Results ◽  
Absorbed Energy ◽  
Charpy Test ◽  
Iron And Steel ◽  
International Effort ◽  
Impact Tests ◽  
Data Variability

We investigated the influence of the state of wear of Charpy machine anvils on test results byperforming impact tests on NIST specimens of three energy levels with a machine equipped with new anvils (compliant with both ASTM E23 [1] and ISO 148-2 [2]) and worn anvils (anvil corner radii and distance outside ASTM tolerances, but within ISO tolerances). The results obtained, statistically analyzed, unequivocally show that worn anvils tend to increase absorbed energy at all energy levels. On the other hand, data variability does not appear to be significantly affected by anvil wear. This study represents NIST contribution to an international effort spearheaded by the Japan Iron and Steel Federation Standardization Center (Tokyo, Japan).

scholarly journals Low-Velocity Impact Behavior of Interlayer/Intralayer Hybrid Composites Based on Carbon and Glass Non-Crimp Fabric

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2472 ◽  
Author(s):  
Chen Zhang ◽  
Yunfei Rao ◽  
Zhe Li ◽  
Wei Li
Keyword(s):  
Hybrid Composite ◽  
Composite Laminates ◽  
Hybrid Composites ◽  
Low Velocity Impact ◽  
Hybrid Structures ◽  
Impact Behavior ◽  
Absorbed Energy ◽  
Low Velocity ◽  
Velocity Impact ◽  
Impact Tests

Composites have gained wide use in structural applications; however, they are sensitive to impact damage. The use of hybrid composites is an effective way to overcome this deficiency. The effects of various hybrid structures of interlayer and intralayer warp-knitted fabrics with carbon and glass fibers on the low-velocity impact behavior of composite laminates were studied. Drop-weight impact tests were conducted on two types of interlayer, sandwich and intralayer hybrid composite laminates, which were compared with homogenous composite laminates. During low-velocity impact tests, the time histories of impact forces and absorbed energy by laminate were recorded. The failure modes were analyzed using the micro-CT (computed tomography) and C-scan techniques. The results revealed that the hybrid structure played an important role in peak force and the absorbed energy, and that the hybrid interface had an influence on damage modes, whereas the intralayer hybrid composite laminate damage was affected by the impact location. The intralayer hybrid laminate with C:G = 1:1 exhibited better impact resistance compared to the other hybrid structures.

Deformation and Fracture of Al-Li Alloys in Mechanical-Impact Tests

Materials ◽  
1992 ◽  
pp. 19-28
Author(s):  
R. P. Reed ◽  
C. N. McCowan ◽  
N. J. Simon ◽  
J. D. McColskey
Keyword(s):  
Mechanical Impact ◽  
Impact Tests ◽  
Deformation And Fracture
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