scholarly journals Effect of the Holding Time at Maximum Temperature on the Thermal Fatigue Life under Conditions of Transient Temperature Gradient

1967 ◽  
Vol 16 (163) ◽  
pp. 228-233
Author(s):  
Taro UEDA ◽  
Masao TANAKA ◽  
Hiroshi KANNO
Keyword(s):  
Fatigue Life ◽  
Temperature Gradient ◽  
Thermal Fatigue ◽  
Holding Time ◽  
Maximum Temperature ◽  
Transient Temperature ◽  
Thermal Fatigue Life

Effects of Thermal Cycle Conditions on Thermal Fatigue Life of Substrate With Cu Through-Hole

2015 ◽  
Author(s):  
Yu Yamayose ◽  
Tetsuya Kugimiya ◽  
Kenji Hirohata ◽  
Akihiko Happoya ◽  
Nobutada Ohno ◽  
...  
Keyword(s):  
Thin Film ◽  
Fatigue Life ◽  
Thermal Fatigue ◽  
Thermal Cycle ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Maximum Temperature ◽  
Thermal Fatigue Life ◽  
Cu Thin Film ◽  
Through Hole

The Cu through-hole is a structure of electroplated Cu thin film, which penetrates the substrate. Because of the mismatch of the thermal expansion coefficient between the Cu thin film and the substrate along the thickness direction, thermal strain occurs repeatedly at the Cu through-hole part with the variation of temperature. As a result, the thermal fatigue failure of Cu through-hole part is one of the failure modes of the substrate. In this study, the effects of thermal cycle conditions on the thermal fatigue life of the substrate with Cu through-hole were investigated by thermal cycle tests and Finite Element Method (FEM)-based analyses. Thermal cycle tests of the substrate with Cu through-hole were conducted under different thermal conditions. The effects of dwell time, temperature range and maximum temperature were investigated. Among these factors, the maximum temperature shows the greatest influence on the thermal fatigue life of Cu through-hole part. FEM-based thermal cycle analyses were also carried out to understand the effects of thermal cycle conditions. The glass cloth structures of the substrate should be considered in the analyses, because their rigid properties probably affect the generation of the failure at the through-hole part. In this study, glass cloth structures were modeled by taking advantage of a homogenization method. On the other hand, the inelastic constitutive model of the electroplated Cu thin film was introduced in the analyses in order to describe the creep deformation during the dwell process of thermal cycles. The inelastic strain range of the Cu through-hole during thermal cycles was calculated from the analysis results and the effectiveness of the Coffin-Manson law was evaluated. The results showed that the fatigue life prediction using the Coffin-Manson model was effective in the range of the same substrate thickness and the same maximum temperature. Additionally the influences of material model and material constants of epoxy resin were investigated to expand the range of application of the fatigue life prediction.

Study on Thermal Fatigue Life Prediction of Cylinder Head

2012 ◽  
Vol 433-440 ◽  
pp. 3-8 ◽  
Author(s):  
Wei Mao Zhao ◽  
Wei Zheng Zhang
Keyword(s):  
Fatigue Life ◽  
Fatigue Test ◽  
Thermal Fatigue ◽  
Life Prediction ◽  
Heating Time ◽  
Test Method ◽  
Fatigue Life Prediction ◽  
Maximum Temperature ◽  
Thermal Fatigue Test ◽  
Thermal Fatigue Life

Thermal fatigue tests were conducted on diesel engine cylinder heads of gray cast iron HT250 with conductive heating fatigue test rig. The thermal fatigue life is affected by the maximum temperature and heating time. The relationship between thermal fatigue life, temperature, and heating time was researched. Thermal fatigue life prediction model was derived from classical energy fatigue criteria. The parameters of the model were obtained from the results of the thermal fatigue test. The model and thermal fatigue test method are suitable for cylinder heads of cast irons and cast aluminum alloys, the parameters should be fixed by thermal fatigue test.

scholarly journals Prediction of Thermal Fatigue Life of Lead-Free BGA Solder Joints by Finite Element Analysis

2001 ◽  
Vol 42 (5) ◽  
pp. 809-813 ◽  
Author(s):  
Young-Eui Shin ◽  
Kyung-Woo Lee ◽  
Kyong-Ho Chang ◽  
Seung-Boo Jung ◽  
Jae Pil Jung
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Thermal Fatigue ◽  
Solder Joints ◽  
Lead Free ◽  
Element Analysis ◽  
Thermal Fatigue Life

Thermal Fatigue and Fracture Mechanics Analysis of Aluminium Alloy

2011 ◽  
Vol 201-203 ◽  
pp. 2476-2480
Author(s):  
Wen Xiao Zhang ◽  
Guo Dong Gao ◽  
Guang Yu Mu
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Fracture Mechanics ◽  
Thermal Fatigue ◽  
Low Carbon Steel ◽  
Strain Range ◽  
J Integral ◽  
Low Carbon ◽  
Thermal Fatigue Life ◽  
Energy Aspect

The in-phase and out-of-phase thermal fatigue of aluminum alloy were experimentally studied. The fatigue life was evaluated analytically by using the elastic-plastic fracture mechanics method (mainly J integral). The results of experiments and calculations showed that the life of out-of-phase fatigue was longer than that of in-phase fatigue within the same strain range. This is the same as the results of other materials such as medium and low carbon steel. On the other hand, the predicted life was consistent with experimental results. This suggests that J integral as a mechanics parameter for characterizing the thermal fatigue strength of aluminum alloy and the calculation method developed here is efficient. A parameter ΔW was proposed from energy aspect to characterize the capacity of crack propagation. The in-phase thermal fatigue life was the same as the out-of-phase thermal fatigue life for identical ΔW values.

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