Structured Method to Establish the Enhance of Fatigue Life of Mechanical System Such as a Drawer by Accelerated Tests | Chapter 1 | Recent Progress in Science and Technology Vol. 7

 Parametric Accelerated Life Testing (ALT) is submitted as a design to find design imperfections and lower fatigue deficiency in consideration of increase the old age of a machinelike system. It more involves a sample diameter equating for the ALT and a root of the statement period to deficiency model apiece uninterrupted transport process. As an instance, a fridge items in container was likely. The center support was bent and the fume rollers insolvent after stowing. The fume swell support was extended, and the center support taken supplementary teases. The box cover at the first ALT abandoned nearly place the cover and bulk converged. The tease and fastener were therefore additional in better amounts to television set. The center support and rails fracture at the second ALT. They were transformed by setting the tease and turning the corners. There were easy thing to accomplish later the after second ALT. The items in container existence was assured expected B1 growth 10 age.

Author(s) Details:

Seongwoo Woo,
Manufacturing Technology, Mechanical Technology Faculty, Ethiopian Technical University, Addis Ababa, P.O. Box 190310, Ethiopia.

Dennis L. O’Neal,
Department of Mechanical Engineering, School of Engineering and Computer Science, Baylor University, Waco, TX 76798-7356, USA.

Yimer Mohammed Hassen,
Manufacturing Technology, Mechanical Technology Faculty, Ethiopian Technical University, Addis Ababa, P.O. Box 190310, Ethiopia.

Gezae Mebrahtu,
Manufacturing Technology, Mechanical Technology Faculty, Ethiopian Technical University, Addis Ababa, P.O. Box 190310, Ethiopia.


Please see the link here: https://stm.bookpi.org/RPST-V7/article/view/9947

Study on Reliability Design of Mechanical Systems Such as Compressor Subjected to Repetitive Stresses | Chapter 02 | Technological Innovation in Engineering Research Vol. 2

 When constructing a reliable quantitative (RQ) specification, this study shows how parametric accelerated life testing (ALT) may be used to uncover design defects in mechanical devices. It consists of four components: (1) a system BX lifetime for which X of a product population fails, developed using the parametric ALT scheme, (2) fatigue and redesign, (3) adapted ALTs with design alternations, and (4) a determination of whether the system design(s) achieve the objective BX lifetime. As a consequence, a life-stress model is provided, as well as a sample size formulation. A mass/energy balance on the vapor-compression cycle was explored to assess the compressor's pressure loading and perform parametric ALT. The compressor failed during the first ALT owing to a damaged or fractured suction reed valve constructed of Sandvik 20C. Steel made of carbon (1 wt percent C, 0.25 wt percent Si, 0.45 wt percent Mn). Due to an overlap between the suction reed valve and the valve plate, as well as frequent pressure loading, the suction reed valves were tired. To fix the problem, the valve plate's trespan dimensions, tumble process, ball peening, and brushing processes were employed. Due to interference between the crankshaft and thrust washer, the compressor locked at the second ALT. The heat treatment on the outside of the cast iron crankshaft was indicated in the corrective action plan (0.45 wt percent C, 0.25 wt percent Si, 0.8 wt percent Mn, 0.03 wt percent P). Following these design adjustments, there were no difficulties during the third ALT.

Author(S) Details

Seongwoo Woo
Department of Mechanical Engineering, College of Electrical and Mechanical Engineering, Addis Ababa Science and Technology University, Addis Ababa P.O. Box-16417, Ethiopia.

Dennis L. O’Neal
Department of Mechanical Engineering, School of Engineering and Computer Science, Baylor University, Waco, TX 76798-7356, USA.

Yimer Mohammed Hassen
Department of Mechanical Engineering, College of Electrical and Mechanical Engineering, Addis Ababa Science and Technology University, Addis Ababa P.O. Box-16417, Ethiopia.

View Book:- https://stm.bookpi.org/TIER-V2/article/view/6838

Study on Improving the Fatigue of Newly Designed Mechanical System Such as Hinge Kit System | Chapter 08 | Technological Innovation in Engineering Research Vol. 1

 The goal of this study is to create parametric accelerated life testing (ALT) as a systematic reliability approach for creating reliability quantitative (RQ) requirements – mission cycle – in mechanical goods. The use of parametric ALT to mechanical systems subjected to repetitive impact loads enhances fatigue failure prediction. It consists of four components: (1) a parametric ALT plan based on the system's BX lifetime, (2) a fatigue failure and design, (3) customised ALTs with design possibilities, and (4) an assessment of whether the system's most recent design(s) fits the BX lifetime target. A generalised life-stress model and a sample size equation are provided. The concept was presented utilising a newly built mechanical domestic refrigerator hinge kit system (HKS). Multiple impact loads were applied to the HKS, resulting in field failure. To determine the amount of accelerated testing required, The HKS was subjected to a basic impact loading when the refrigerator door was shut using a force and momentum balance. The hinge kit housing was changed after the HKS housing collapsed during the original ALT. Inner supporting ribs were attached to the HKS to provide enough mechanical strength against its loading. At the second ALT, the torsional shaft in HKS made of austenitic ductile iron (18 wt% Ni) failed. The damaged torsional shaft of the second ALT was caused by inadequate rounding, which failed under repetitive load. As part of the modification, the torsional shaft was rounded from R0.5mm to R2.0mm of a strategy for ensuring enough material strength for recurrent impact loads Following these adjustments, there were no difficulties at third ALT.

Author(S) Details

Seongwoo Woo
Ethiopia Manufacturing Technology, Mechanical Technology Faculty, Ethiopian Technical University, Addis Ababa P.O.Box 190310, Ethiopia.

Dennis L. O’Neal
School of Engineering and Computer Science, Baylor University, Waco, TX 76798-7356, USA.

Yimer Mohammed Hassen
Ethiopia Manufacturing Technology, Mechanical Technology Faculty, Ethiopian Technical University, Addis Ababa P.O.Box 190310, Ethiopia.

View Book:- https://stm.bookpi.org/TIER-V1/article/view/6806