Failure Mechanism of Twist Drill in Vibration Drilling of Duralumin

2010 ◽  
Vol 97-101 ◽  
pp. 2107-2110
Author(s):  
Li Jie Ma ◽  
Xi Bin Wang ◽  
Guan Jun Liu ◽  
Xi Qu Chen ◽  
Su Fang Fu
Keyword(s):  
Failure Mechanism ◽  
Failure Mode ◽  
Rake Face ◽  
Twist Drill ◽  
Vibration Drilling ◽  
Clearance Face

Based on experiments of common drilling and vibration drilling on duralumin (2A12), the failure mode and failure reason of twist drill are studied theoretically and experimentally. The result shows that, compared with common drilling, the wear of clearance face and rake face decreases evidently during vibration drilling, and the wear of chisel edge and marginal point of twist drill hardly happens. Moreover the probability of drill breakage is very low during vibration drilling. However, if amplitude is bigger, the tipping of chisel edge often appears.

Reliability Detection of Process-Induced Metallization Defects in GaAs Devices

2015 ◽  
Vol 1792 ◽  
Author(s):  
Steve H. Kilgore
Keyword(s):  
Failure Mechanism ◽  
Failure Mode ◽  
Process Improvement ◽  
Physical Characterization ◽  
Reliability Testing ◽  
Au Film ◽  
Gaas Devices ◽  
Early Failures ◽  
Induced Defects

ABSTRACTProcess-induced defects in electroplated Au interconnect metallization on GaAs devices were detected during the course of reliability testing. Abnormally high lognormal sigma values (σ > 0.7) indicated the existence of a bi-modal failure mechanism. A distinct early lifetime failure mode was observed along with the intrinsic electromigration metallization wear-out failure mode. Physical characterization of the electroplated Au film revealed as-deposited nanoscale voids. Elimination of these voids through process improvement as well as suggested mechanisms for the early failures are discussed.

The Study of Assessment on the Environmental Adaptability of Weapons and Equipment

2012 ◽  
Vol 472-475 ◽  
pp. 3182-3187
Author(s):  
Jing Yang ◽  
Xiao Hui Wang ◽  
Yong Wu
Keyword(s):  
High Temperature ◽  
Failure Mechanism ◽  
Failure Mode ◽  
Optimization Method ◽  
High Humidity ◽  
Environmental Adaptability ◽  
The Impact ◽  
Salt Fog

High temperature, high humidity, corrosive substances in the air and a variety of fungus are devastating for the product, so how to correctly evaluate the impact of three defenses of the product is particularly important. Basing on the failure of the salt fog, humidity, and fungus, this paper will analyse the product’s failure mechanism and failure mode and then use fuzzy satisfactory optimization method to evaluate the product’s environmental adaptability in the humidity, salt fog and fungus condition.

Failure Modes of a Laminated Composite With Complaint Interlayers

2020 ◽  
Vol 88 (3) ◽  
Author(s):  
M. R. O’Masta ◽  
V. S. Deshpande
Keyword(s):  
Failure Mechanism ◽  
Failure Mode ◽  
Failure Modes ◽  
Volume Fraction ◽  
Flexural Rigidity ◽  
Laminated Composite ◽  
High Volume ◽  
Tensile Fracture ◽  
Reduced Order ◽  
Fe Simulations

Abstract Composites comprising a high-volume fraction of stiff reinforcements within a compliant matrix are commonly found in natural materials. The disparate properties of the constituent materials endow resilience to the composite, and here we report an investigation into some of the mechanisms at play. We report experiments and simulations of a prototype laminated composite system comprising silicon layers separated by polymer interlayers, where the only failure mechanism is the tensile fracture of the brittle silicon. Two failure modes are observed for such composites loaded in three-point bending: failure under the central roller in (i) the top ply (in contact with the roller) or (ii) the bottom ply (free surface). The former mode is benign with the beam retaining load carrying capacity, whereas the latter leads to catastrophic beam failure. Finite element (FE) simulations confirm this transition in failure mode and inform the development of a reduced order model. Good agreement is shown between measurements, FE simulations, and reduced order predictions, capturing the effects of material and geometric properties on the flexural rigidity, first ply failure mode, and failure load. A failure mechanism map for this system is reported that can be used to inform the design of such laminated composites.

A Performance Study on Self-Piercing Riveting and Adhesive Hybrid Joints of Different Adhesive

2014 ◽  
Vol 887-888 ◽  
pp. 1261-1264
Author(s):  
Fu Long Liu ◽  
Xiao Cong He ◽  
Yu Qi Wang
Keyword(s):  
Failure Mechanism ◽  
Energy Absorption ◽  
Failure Mode ◽  
Failure Modes ◽  
Test Results ◽  
Performance Study ◽  
Strength Capacity ◽  
Hybrid Joints ◽  
Overall Performance ◽  
Tension Loading

This paper studied the performance of self-piercing riveting (SPR) and adhesive hybrid joints of different adhesive, including strength, capacity of energy absorption, failure mode and failure mechanism of the hybrid joints. The performances of SPR-adhesive hybrid joints were compared with SPR joints. SPR-adhesive hybrid joints and SPR joints were tested under a tension loading. The test results showed that adhesive have a function of improving the strength of SPR joints; however, the capacity of energy absorption of SPR joints was weakened. While the adhesive have no effect on the failure modes of SPR joints. When appropriate adhesive was selected, the overall performance of SPR-adhesive hybrid joints was superior to SPR joints. In a word, the combination of SPR and adhesive could get a well jointing structure.

The Study on Mechanical Properties of Single-Bolted Steel-Glulam-Steel Joints

2011 ◽  
Vol 255-260 ◽  
pp. 204-208 ◽  
Author(s):  
De Liang Xu ◽  
Wei Qing Liu ◽  
Ding Zhou ◽  
Jian Dong Ding ◽  
Ying Lei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bearing Capacity ◽  
Failure Mechanism ◽  
Failure Mode ◽  
Mechanical Performance ◽  
Timber Structures ◽  
Bolted Connections ◽  
Steel Connections ◽  
Steel Connection ◽  
Steel Joints

Seven groups, total of 31 single-bolted steel-glulam-steel joints, were tested for their mechanical performance. The mechanical properties of single-bolted steel-glulam-steel connection subjected to a load parallel to the grain have been studied. The failure mode and failure mechanism of bolted connections were discussed in detail. It is shown that the failure mode, bearing capacity, stiffness and ductility of the joint are mainly relative to the thickness of the glulam and the diameter of the bolt. Due to the wide application of bolted steel-glulam-steel connections in engineering, the present work can be taken as a reference in manufacture, and design of modern timber structures.

Study on Ultrasonic Vibration Drilling of Particulate Reinforced Aluminum Matrix Composites

2005 ◽  
Vol 291-292 ◽  
pp. 447-452 ◽  
Author(s):  
C.S. Liu ◽  
Bo Zhao ◽  
G.F. Gao ◽  
X.H. Zhang
Keyword(s):  
Ultrasonic Vibration ◽  
Metal Matrix ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Twist Drill ◽  
The Common ◽  
Vibration Drilling ◽  
Al Matrix Composites ◽  
Particulate Reinforced

Metal matrix composites（MMCs）is applied widely in recent years because of its excellent performances, but the machining is very difficult due to the rigidity of reinforced-phase in it, so, the application of MMCs is restricted much. In this paper the experiment of common and ultrasonic vibration drilling is performed to SiC particulate reinforced Al matrix composites （SiCp/Al）by use of carbide-alloy-twist-drill, and the surface roughness of hole is compared, furthermore, the wearing of twist drill and the feature of chips are analyzed by scanning electron microscope (SEM). From above, we can draw aconclusion that ultrasonic vibration drilling may meliorate the mechanism of drilling to some extent and it takes on much superiority that the common drilling is unmatched, so this method could provide a certain foundation for the posterior study and application.

The CFRP Material's Mechanical Performance and Application

2010 ◽  
Vol 29-32 ◽  
pp. 1777-1782
Author(s):  
Jun Zhao ◽  
Quan Sheng Liu ◽  
Kai Shi
Keyword(s):  
Reinforced Concrete ◽  
Failure Mechanism ◽  
Failure Mode ◽  
Mechanical Performance ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Normal Section ◽  
Practical Project

This paper analyzes the normal section capacity of the reinforced concrete paste with CFRP. Based on the models under different pasting conditions(U model, one layer at the bottom plus one layer of U model, two layers in the bottom), and experiments on the reinforced concrete beams with CFRP, we will analyze the failure mechanism and failure mode of reinforced concrete beams, and calculate the limit bending capacities. The results are directly applied to practical project.

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