Comparative Study of Crack Length and Damage Volumes on Ceramic Coated Glass by Particle Impact

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1335-1341 ◽  
Author(s):  
Chang Min Suh ◽  
Moon Hwan Lee ◽  
Sung Ho Kim ◽  
Dong Gyun Kim ◽  
Young Guen Choi ◽  
...  
Keyword(s):  
Impact Damage ◽  
Plasma Coating ◽  
Steel Ball ◽  
Coating Materials ◽  
Ball Impact ◽  
Damage Behavior ◽  
Coated Glass ◽  
Coating Method ◽  
Steel Balls ◽  
The Impact

A ceramic plasma-coating method that reduces impact damage from the impact by round particles to a ceramic material is suggested. A steel-ball impact test was performed to investigate and compare the damage behavior of uncoated and ceramic-coated glass relative to the impact velocity and impact energy of the steel balls. Damaged volume measured and compared, for different steel-ball diameters and types of coating materials, Al 2 O 3- TiO 2, Al 2 O 3, and Cr 2 O 3. In addition, experimental equations were derived from the results, to define the experimental properties of the damage behavior exhibited by the ceramic-coated and uncoated glass.

A STUDY ON DAMAGE BEHAVIOR OF GLASS BY OBLIQUE IMPACT OF STEEL BALL

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4291-4296 ◽  
Author(s):  
CHANG-MIN SUH ◽  
DONG-KYUN KIM ◽  
MOON-HWAN LEE
Keyword(s):  
Finite Element ◽  
Crack Length ◽  
Impact Test ◽  
Oblique Impact ◽  
Steel Ball ◽  
Crack Growth Behavior ◽  
Soda Lime Glass ◽  
Ball Impact ◽  
Damage Behavior ◽  
The Impact

The damage behavior of soda-lime glass was studied by oblique impact test with a steel ball, and in order to investigate the effect of roughness damage on glass, variable damages and strength degradation of smooth and Al 2 O 3 sand blasted for roughness glass was investigated by the ball impact test. After the test, the crack patterns were investigated using a stereo-microscope. In addition, the finite element method was performed to analyze the stress distribution and variation in the glass impacted obliquely by the steel ball. As a result of the impact test, the crack length of 90° impacted glass was the largest and that of 50° impacted glass was the smallest. In particular, as the impact velocity and diameter of the steel ball increased, the difference in crack length was prominent. The finite element analysis showed the maximum principle stresses distribution in the contact area of glass specimen. The result of analysis was accorded with the crack growth behavior by the oblique impact test.

Fatigue Behavior of Impacted Plain-Weave Glass/Epoxy Composites under Tensile Fatigue Loading

2005 ◽  
Vol 297-300 ◽  
pp. 1291-1296 ◽  
Author(s):  
Ki Weon Kang ◽  
Jung Kyu Kim ◽  
Heung Seob Kim
Keyword(s):  
Fatigue Life ◽  
Impact Damage ◽  
Fatigue Behavior ◽  
Fatigue Loading ◽  
Epoxy Composites ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Damage Behavior ◽  
Plain Weave ◽  
The Impact

The goals of this paper are to identify the impact damage behavior of plain-weave E-glass/epoxy composites and predict the fatigue life of the composites with impact-induced damage under constant amplitude loading. To identify these behaviors, the low velocity impact and fatigue after impact tests are performed for glass/epoxy composites having two types of fiber orientations. The impact damage behavior is dependent on the fiber orientation of the composites. The fatigue life of the impacted composites can be identified through the prediction model, which was proposed on the carbon/epoxy laminates by authors regardless of fiber orientations.

EXPERIMENTAL STUDY OF THE IMPACT DAMAGE ON AN Al2O3-COATED GLASS UNDER STRESS

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4529-4534 ◽  
Author(s):  
CHANG-MIN SUH ◽  
SUNG-HO KIM ◽  
DUCK-YOUNG SUH
Keyword(s):  
Compressive Stress ◽  
Impact Test ◽  
Impact Damage ◽  
Soda Lime ◽  
Target Distance ◽  
Soda Lime Glass ◽  
Optimum Conditions ◽  
Stereo Microscope ◽  
Steel Balls ◽  
The Impact

The impact damage of an Al 2 O 3-coated soda-lime glass under tensile and compressive stress conditions was investigated by an impact test using a steel ball (2mm dia.). The size of the glass specimens was 40×40×5( mm ). In order to change the porosity percent of each specimen, the target distance was set at 120mm and 70mm. Also, the effect of the thickness of the coating layer was shown by two amounts (100 μm and 50 μm). The velocity of the steel balls was set between 30 and 60m/s. After the impact test, the crack patterns and lengths were measured using a stereo-microscope. The tensile and compressive specimens were prepared by inflation and deflation of air pressure within a pressure vessel. It was confirmed that the crack length of the glass under tensile stress was longer than that of glass under compressive stress. Also, the optimum conditions were a target distance of 70mm and 100 μm of a coating thickness, thus resulting in a minimization of porosity percent and area.

Study on damage behavior of carbide tool for milling difficult-to-machine material

2018 ◽  
Vol 233 (2) ◽  
pp. 735-747
Author(s):  
Yao-Nan Cheng ◽  
Wan-Ying Nie ◽  
Rui Guan ◽  
Wei-Kun Jia ◽  
Fu-gang Yan
Keyword(s):  
Failure Modes ◽  
Impact Load ◽  
Impact Damage ◽  
High Plasticity ◽  
Carbide Tool ◽  
Machine Material ◽  
Tool Failure ◽  
Damage Behavior ◽  
Tool Damage ◽  
The Impact

Water chamber head is an important component of nuclear power unit, and the main material is 508 III steel of difficult-to-machine material, which has the characteristics of high hardness, high strength, high plasticity and high profile shrinkage, etc. During the milling process, the tool is subjected to the cyclic impact load, which make cutting force and cutting heat change violent and occurrence of tool damage failure accelerate. In this paper, the damage behavior of carbide tool for milling difficult-to-machine material is studied first, and then field experiment was carried out on 508 III steel material, tool failure modes were analyzed, which include impact damage and fatigue fracture, and the failure theory and the crack propagation of carbide material were investigated in the process of tool damage. Then, the impact damage model of carbide tool is established based on the classical strength theory, and the critical condition of impact damage is determined according to simulation analysis. Finally, the theoretical model of carbide tool fatigue life is established and the tool fatigue limit is analyzed. Theoretical basis and technical support are provided for the tool failure mechanisms analysis, life prediction, parameter optimization, tool design and development aspects during the study.

scholarly journals Harvest of table olives by mechanical harvesting equipment

2013 ◽  
Vol 44 (2s) ◽  
Author(s):  
Filippo Gambella
Keyword(s):  
Natural Rubber ◽  
Impact Damage ◽  
Olive Tree ◽  
Table Olives ◽  
Coating Materials ◽  
Positive Role ◽  
Vulcanized Rubber ◽  
Plastic Materials ◽  
Materials Used ◽  
The Impact

In this work, we have evaluated the performance, of an electric comb equipped with five undulated fingers used for mechanized the harvesting of table olives. The first aim of the work was to test three different types of coating materials used for covering the fingers: Silicon (S), Vulcanized rubber (VR) and Natural rubber (NR). The diameter of the coating materials tested were 7mm (D1), 14 mm (D2), 19 mm (D3) in order to evaluate the damage of different working conditions on the intact olives. During harvesting, silicon at 7mm and 14mm resulted in the largest percentage of undamaged the fruit (67% and 65%), natural rubber 63% and vulcanized rubber at the 54%. The second aim was to evaluate the combination, in terms of the best performance, of the machines used for mechanized harvesting of table olives. Several factors have been examined: undulating fingers variation thickness, different rotational speeds and different coating materials used to reduce the impact damage on olives. From the tests on olive tree we have determined that while plastic materials (S) and (NR) appear to have a positive role in harvest quality, the vibration transmitted to the operator’s hand is great from 6.48 m/s2 for S to 6.31 m/ s2 for NR and 2.92 m/s2 for VR, respect to the materials used.

Impact Damage Behavior of Glass/Epoxy Laminates for Railway Vehicle at Low Temperature

2006 ◽  
Vol 326-328 ◽  
pp. 1793-1796
Author(s):  
Ki Weon Kang ◽  
Seung Yong Yang ◽  
J.H. Kim ◽  
Jung Kyu Kim ◽  
Heung Seob Kim ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Impact Damage ◽  
Testing Machine ◽  
Impact Testing ◽  
Low Velocity Impact ◽  
Railway Vehicle ◽  
Low Velocity ◽  
Damage Resistance ◽  
Damage Behavior ◽  
The Impact

This paper deals with the damage behavior of glass/epoxy composite laminates subjected to low-velocity impact at various temperatures. For this goal, the impact tests were performed by using an instrumented impact-testing machine at three temperatures: +20°C, -10°C and -40°C. And the resultant damages were inspected through the scanning acoustic microscope (SAM). Also, based on the impact force history and the damage configuration of the laminates, the impact resistance parameters were employed to evaluate damage resistance of glass/epoxy laminates. As results, it was found that the temperature changes affect the damage resistance capacity of glass/epoxy laminates.

Comparison of Low-Velocity Impact Damage Behavior of Unidirectional Carbon Fiber-Reinforced Thermoset and Thermoplastic Composites

2019 ◽  
Vol 809 ◽  
pp. 9-14
Author(s):  
Florian Schimmer ◽  
Sven Ladewig ◽  
Nicole Motsch ◽  
Joachim M. Hausmann ◽  
Ingo Ehrlich
Keyword(s):  
Cross Sections ◽  
Impact Damage ◽  
Test Methods ◽  
Impact Testing ◽  
Low Velocity Impact ◽  
Thermoplastic Composites ◽  
Fiber Reinforced ◽  
Low Velocity ◽  
Damage Behavior ◽  
The Impact

This paper investigates the damage behavior of thermoset and thermoplastic fiber-reinforced composites. The specimens were subjected to low-velocity impacts (LVI) to produce barely visible impact damages (BVID). To compare the dependency of the matrix system and the laminate lay-up on the impact damage, four test series were set up. Therefore, laminates with an epoxy (EP) and a polyether ether ketone (PEEK) matrix in a quasi-isotropic (QI) [+45/0/-45/90]2s and an orthotropic (OT) fiber lay-up [0/90]4s were manufactured. To eliminate the influence of variant fiber systems, the thermoplastic tape and the thermoset prepreg contain similar carbon fibers (CF). After impact testing with three different impact energies, inner damages were investigated by using ultrasonic analyses. To get a deeper understanding of the interior damage mechanisms, cross sections of the damaged areas were examined via reflected light microscopy. By using these destructive and non-destructive test methods, significant differences in the damage behavior of composites with thermoplastic and thermoset matrix systems were identified for both laminate lay-ups.

Impact Damage Behavior of Composite Stiffened Plates

2011 ◽  
Vol 117-119 ◽  
pp. 954-957
Author(s):  
Li Yan ◽  
Xue Feng An ◽  
Chen Qian Zhang ◽  
Xiao Su Yi
Keyword(s):  
Impact Damage ◽  
Visual Observation ◽  
Impact Testing ◽  
Low Velocity Impact ◽  
Stiffened Plates ◽  
Low Velocity ◽  
Damage Behavior ◽  
Damage Area ◽  
Impact Position ◽  
The Impact

Damage behavior of composite stiffened plates of structure I and structure II at different positions and under different impact energy subjected to low-velocity impact testing was studied in this paper. Visual observation and ultrasonic C-scanning were also employed to inspect the damage size. The results showed that damage behavior of composite stiffened plates was not only related to damage behavior of laminates, but also related to damage between stringer and laminate and damage of stringer itself. It was found that the mechanism of absorbing energy varies with the impact position, as well as the damage behavior. When the impact position was near stringer, partial energy was absorbed by stringer to make stringer and laminate disengage and damage area of laminates was smaller. Damage behavior of composite stiffened plates varies with the structure. Damage area of samples of structure II was smaller than that of samples of structure I. It was estimated preliminarily that design of structure II was better than that of structure I.

Study on the Damping Effects of an Impact Damper Using a Elasto-Plastic Material

2006 ◽  
Author(s):  
Tomohiro Ito ◽  
Katsuhisa Fujita ◽  
Naotoshi Okaya
Keyword(s):  
Relative Velocity ◽  
Impact Force ◽  
Plastic Material ◽  
Low Cost ◽  
Restitution Coefficient ◽  
Ball Impact ◽  
Impact Damper ◽  
Force Modeling ◽  
Steel Balls ◽  
The Impact

Conventional impact dampers often utilize the steel balls because of its low cost and handling easiness. But the steel-ball impact dampers sometimes collapse or generate very large noise because of large shock at the impact. And as for the design of the impact damper, in the conventional approaches, the analytical modeling for the impact force is based on the contact theory proposed by H. Hertz, in which the restitution coefficient is assumed to be constant, i.e., the dependency on the relative velocity is not taken into consideration. However, some experimental results show that the restitution coefficient depends on the relative velocity at the impact. In this study, the elasto-plastic materials are employed as an impact damper material in order to suppress the large shock for the damper vessel and large impact noise. Therefore, the impact force modeling is modified so as that the elasto-plasticity of the material can be considered. This modeling can also consider the dependency of the restitution coefficient on the relative velocity. An impact damper which composed of a vessel and several particles made of elasto-plastic material such as lead is treated. The frequency response of the damper vessel and the damping effect of the damper are evaluated for the 2 kinds of impact force modeling by numerical simulations. Also, the effects of the particle number and the vessel configuration are evaluated. As a result, the effects of the above mentioned parameters are clarified.

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