Residual stress relaxation of cubic boron nitride thin films deposited in Ar with other noble gases

The work of nanoindentation approach is developed and applied for measure of residual stress relaxation during indenter penetrates in thin films. The residual stress at given penetration depth is measured from the different integral area which under load-depth curve of different stress state. This method can measure residual stress relaxation without the need for estimating yield strength, strain hardening index and hardness.

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Residual-stress relaxation in polysilicon thin films by high-temperature rapid thermal annealing

Sensors and Actuators A Physical ◽

10.1016/s0924-4247(97)01661-0 ◽

1998 ◽

Vol 64 (1) ◽

pp. 109-115 ◽

Cited By ~ 32

Author(s):

Xin Zhang ◽

Tong-Yi Zhang ◽

Man Wong ◽

Yitshak Zohar

Keyword(s):

Thin Films ◽

Residual Stress ◽

High Temperature ◽

Stress Relaxation ◽

Thermal Annealing ◽

Rapid Thermal Annealing ◽

Residual Stress Relaxation ◽

Temperature Rapid Thermal Annealing

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Comparative study of the effective parameters on residual stress relaxation in welded aluminum plates under cyclic loading

Mechanics & Industry ◽

10.1051/meca/2020061 ◽

2020 ◽

Vol 21 (5) ◽

pp. 505

Author(s):

Yousef Ghaderi Dehkordi ◽

Ali Pourkamali Anaraki ◽

Amir Reza Shahani

Keyword(s):

Residual Stress ◽

Cyclic Loading ◽

Stress Relaxation ◽

Stress Amplitude ◽

Cyclic Plasticity ◽

Mean Stress ◽

Effective Parameters ◽

Perfect Plasticity ◽

Residual Stress Relaxation ◽

Aluminum Plates

The prediction of residual stress relaxation is essential to assess the safety of welded components. This paper aims to study the influence of various effective parameters on residual stress relaxation under cyclic loading. In this regard, a 3D finite element modeling is performed to determine the residual stress in welded aluminum plates. The accuracy of this analysis is verified through experiment. To study the plasticity effect on stress relaxation, two plasticity models are implemented: perfect plasticity and combined isotropic-kinematic hardening. Hence, cyclic plasticity characterization of the material is specified by low cycle fatigue tests. It is found that the perfect plasticity leads to greater stress relaxation. In order to propose an accurate model to compute the residual stress relaxation, the Taguchi L18 array with four 3-level factors and one 6-level is employed. Using statistical analysis, the order of factors based on their effect on stress relaxation is determined as mean stress, stress amplitude, initial residual stress, and number of cycles. In addition, the stress relaxation increases with an increase in mean stress and stress amplitude.

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Oxygen Impurity in Cubic Boron Nitride Thin Films Prepared by Plasma-enhanced Chemical Vapor Deposition

Journal of Inorganic Materials ◽

10.3724/sp.j.1077.2010.00748 ◽

2010 ◽

Vol 25 (7) ◽

pp. 748-752 ◽

Cited By ~ 2

Author(s):

Hang-Sheng YANG ◽

Fa-Min QIU ◽

An-Min NIE

Keyword(s):

Thin Films ◽

Chemical Vapor Deposition ◽

Boron Nitride ◽

Vapor Deposition ◽

Cubic Boron Nitride ◽

Chemical Vapor ◽

Oxygen Impurity

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Prediction of Residual Stress Relaxation of Shot Peened 2024-T351 Aluminum Alloy: Part 1

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.462-463.1355 ◽

2011 ◽

Vol 462-463 ◽

pp. 1355-1360

Author(s):

Omar Suliman Zaroog ◽

Aidy Ali ◽

Sahari B. Barkawi

Keyword(s):

Residual Stress ◽

Stress Relaxation ◽

Shot Peening ◽

Applied Load ◽

Cold Work ◽

Cyclic Tests ◽

Initial State ◽

Loading Cycle ◽

Residual Stress Relaxation ◽

Alloy Part

It is important to account for residual stress relaxation phenomenon in the design of the component. Specimens of 2024-T351 aluminium alloy were used in this study. The specimens were shot peened under three different shot peening intensities. Cyclic tests for two load magnitudes were performed for 1, 2, 10, 1000 and 10000 cycles. Residual stresses, microhardness and the cold work percentage were measured at initial state and after each loading cycle for the three shot peening intensities and for the two loads. The study revealed that most of the drop in the residual stress, microhardness and cold work happened in the first cycle are dependent on the applied load.

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