Accelerated Vibrational Fatigue Testing of Thin Aluminum and Copper Films at Different Temperatures

2018 ◽  
Author(s):  
Valentina Osipova ◽  
Bernhard Wunderle ◽  
Jorg Arnold ◽  
Jens Heilmann ◽  
Trideep Mahanta
Keyword(s):  
Fatigue Testing ◽  
Copper Films ◽  
Thin Aluminum ◽  
Different Temperatures

Fatigue Testing of Polymeric Hollow Fibre Heat Transfer Surfaces by Pulsating Pressure Loads

2016 ◽  
Vol 821 ◽  
pp. 3-9 ◽  
Author(s):  
Tereza Brožová ◽  
Tomáš Luks ◽  
Ilya Astrouski ◽  
Miroslav Raudenský
Keyword(s):  
Heat Transfer ◽  
Fatigue Testing ◽  
Fatigue Loading ◽  
Hollow Fibre ◽  
Fatigue Tests ◽  
Outer Diameter ◽  
Hollow Fibres ◽  
Different Temperatures ◽  
Hot Bath ◽  
Number Of Cycles

This article deals with fatigue tests of polymeric hollow fibre heat transfer surfaces. The hollow fibres have an outer diameter between 0.5-0.8 mm and wall thickness 10 % of the outer diameter. These plastic heat transfer surfaces have some limitations but also many benefits. One of the limitations is the durability of plastic under fatigue loading. The heat transfer surfaces were subjected to pulsating pressure loads under different conditions (level of pressure, ambient temperature, number of cycles). Firstly, only an internal hydraulic pulsating load was applied and the behaviour of the hollow fibres was observed, focusing especially on the presence of leaks, ruptures, etc.Then, other conditions of operations were added. The heat transfer surfaces were immersed in a hot bath and loaded by internal pulsating pressure and high temperature simultaneously. Testing under different temperatures is important because the temperature significantly affects the material properties. The presence of leaks, ruptures and other possible damage was monitored as with previous tests.

Micro-Tensile and Fatigue Testing of Copper Thin Films on Substrates

1998 ◽  
Vol 546 ◽  
Author(s):  
M. Hommel ◽  
O. Kraft ◽  
S. P. Baker ◽  
E. Arzt
Keyword(s):  
Elastic Strain ◽  
Fatigue Testing ◽  
Tensile Tests ◽  
Copper Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tensile Tester ◽  
Elastic Strains ◽  
External Strain

AbstractA special micro-tensile tester was used to carry out tensile tests of thin copper films on substrates. The elastic strain in the film was measured in-situ using x-ray diffraction and the total strain with an external strain gage. From the elastic strains the stresses in the films were calculated and stress-strain curves were obtained. It was observed that the flow stress increases with decreasing film thickness. The method was also applied to investigate the mechanical behavior of films under cyclic loading.

Thermally-induced stresses in thin aluminum layers grown on silicon

2004 ◽  
Vol 19 (1) ◽  
pp. 74-76 ◽  
Author(s):  
E. Eiper ◽  
R. Resel ◽  
C. Eisenmenger-Sittner ◽  
M. Hafok ◽  
J. Keckes
Keyword(s):  
Thin Films ◽  
Temperature Hysteresis ◽  
X Ray Diffraction ◽  
Hill Model ◽  
Thermally Induced ◽  
X Ray ◽  
Plastic Yield ◽  
Thin Aluminum ◽  
Different Temperatures ◽  
The Hill

Elevated-temperature X-ray diffraction (XRD) was used to evaluate residual stresses in aluminum thin films on Si(100). The films with a thickness of 2 μm were deposited by magnetron sputtering at different temperatures, and XRD measurements were carried out with the heating stage DHS 900 mounted on a Seifert 3000 PTS diffractometer. The strains were characterized always in temperature cycles from room temperature up to 450 °C with steps of 50 °C. Stress values in weakly textured thin films were calculated using the Hill model, applying temperature-dependent X-ray elastic constants of aluminum. The thin films exhibit specific temperature hysteresis of stresses depending on the deposition temperature (being from the range of 50 °C–300 °C). The results allow us to quantify contributions of intrinsic and extrinsic stresses to the total stress in the layers as well as to evaluate phenomena related to plastic yield. The comparison of the data from thin films deposited at different temperatures indicate a dependence of intrinsic stresses on the substrate temperature during deposition as well as the presence of the plastic yield in films during the cool-down after deposition

Numerical modelling and physical simulation of the softening behaviour of hot work tool steels during thermal fatigue

2004 ◽  
Vol 120 ◽  
pp. 649-656
Author(s):  
I. Siller ◽  
W. Waldhauser ◽  
R. Ebner
Keyword(s):  
Thermal Fatigue ◽  
Physical Simulation ◽  
Fatigue Testing ◽  
Fatigue Behaviour ◽  
Fatigue Tests ◽  
Tool Steels ◽  
Chaboche Model ◽  
Different Temperatures ◽  
Pull Tests ◽  
Hot Work Tool Steels

Fatigue due to thermal cycling is one of the main reasons for the damage of tools used in die casting processes. In order to investigate the thermal fatigue behaviour of tool steels a thermal fatigue testing facility was designed and built up. For better understanding of the mechanisms of thermal fatigue finite element-simulations were carried out. To specify the cyclic material behaviour push-pull-tests at different temperatures were performed. The Chaboche-model was used to describe the kinematic material response. Isotropic softening is also taken into account. Depending on the arising accumulated plastic strain stable cyclic deformation or continuous softening occurs. The results are consistent with the accomplished thermal fatigue tests on different hot work tool steels.

Quantitative Evaluation of Crystal Rotation Behavior Around the Fatigue Crack in Copper Films

2005 ◽  
Author(s):  
Kenichi Shimizu ◽  
Tasiyuki Torii
Keyword(s):  
Fatigue Crack ◽  
Quantitative Evaluation ◽  
Crystal Orientation ◽  
Rotation Angle ◽  
Fatigue Testing ◽  
Rotation Axis ◽  
Fatigue Cracks ◽  
Pure Copper ◽  
Copper Films ◽  
Crystal Rotation

Using a fatigue testing method by which fatigue cracks can be initiated and propagated in a film adhered to cover a circular through-hole in a base plate subjected to pull-pull cyclic loads, annealed rolled pure copper films of 100μm thickness were fatigued. In order to discuss about the correlation between fatigue crack propagation and the change of crystal orientation, crystal orientation on the surface of the film materials was measured before and after fatigue testing. The crystallo-graphic information of these films was analyzed using the EBSD (Electron Back-scatter Diffraction) system and the quantitative evaluation method for the crystal rotation angle, the rotation axis and the rotation direction with fatigue testing was developed based on the analysis of crystal orientation matrix. As a result, the crystal rotation angle near the fatigue crack is larger than that apart from the crack and the crystal rotation was quantitatively larger around the transgranular crack than the intergranular crack propagated along the annealing twin boundary.

Experimental Study on the Explosive Welding of Thin Al/Cu Composite Plates

2018 ◽  
Vol 910 ◽  
pp. 52-57
Author(s):  
Yuan Yuan ◽  
Peng Wan Chen ◽  
Er Feng An ◽  
Jian Rui Feng
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Explosive Welding ◽  
Composite Plates ◽  
Hardness Test ◽  
Bending Test ◽  
Micro Hardness ◽  
Thin Aluminum ◽  
Different Temperatures ◽  
Scanning Electron

In this investigation, thin Aluminum alloys 2A12 and Copper T2 composite plates which are both 1mm thick were obtained successfully by the method of explosive welding. The effect of annealing on the interface microstructures of the composite plates was investigated under different temperatures. Optical microscopy, scanning electron microscopy, micro-hardness test and bending test were performed. The results demonstrated that the Al/Cu composite plates were bonded well. The bonding interface of the Al/Cu composite plates had a wavy form. Micro-hardness measurements showed that the hardness of the composite plates near the interface was higher than other parts and the hardness of the whole composite plates was lower after annealing. The bending test showed the composite plates can be deformed or shaped.

Investigation of the Fatigue Behavior of AlMg4.5Mn (EN AW-5083) in the Temperature Range -60 °C < T < 20 °C

2011 ◽  
Vol 690 ◽  
pp. 290-293
Author(s):  
Thomas Kieczka ◽  
Eberhard Kerscher
Keyword(s):  
Endurance Limit ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Testing Machine ◽  
Constant Amplitude ◽  
Climate Chamber ◽  
Temperature Range ◽  
Mechanical Hysteresis ◽  
Different Temperatures ◽  
Load Increase

Stress-controlled load increase and constant amplitude tests have been carried out in a temperature range of -60°C < T < 20°C at the aluminium alloy AlMg4.5Mn (EN AW-5083). Therefore a recently developed climate chamber which operates with liquid nitrogen was mounted on a servo-hydraulic fatigue testing machine to realize the required low temperatures. Beside conventional mechanical hysteresis measurements, electrical resistance and temperature measurements are used to characterize the fatigue behavior. Furthermore, with these methods, the endurance limit was successfully estimated in a load increase test. Woehler curves were determined with constant amplitude tests at different temperatures. The conventionally determined endurance limit corresponds with the value from the load increase test.

Study on the Bending Fatigue Properties of Nomex Fiber

2014 ◽  
Vol 1048 ◽  
pp. 62-65
Author(s):  
Guang Ming Cai ◽  
Xin Wang
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Fatigue Testing ◽  
Ccd Camera ◽  
Fracture Morphology ◽  
Fatigue Properties ◽  
Bending Angle ◽  
Bending Fatigue ◽  
Different Temperatures ◽  
Bending Fatigue Strength

In this paper, we reported a bending fatigue testing apparatus which can test the bending fatigue properties of single Nomex fiber by setting the pretension, bending angle and temperature. The S-N and θ-N curves indicated that the pre-tension and bending angle had great influences on the bending fatigue life of Nomex fiber. A CCD camera was utilized to allow observation of the bending fatigue fracture morphology of fiber. It showed the fracture mechanism of Nomex fibers. The bending fatigue life of Nomex fiber was tested at different temperatures to show that its bending fatigue strength is strongly influenced by the temperature.

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