FEM analysis of dispersive elastic waves in three-layered composite plates with high contrast properties

Zupančič, Borut; Prokop, Yuliia; Nikonov, Anatolij

doi:10.1016/j.finel.2021.103553

Cited by 8 publications

(2 citation statements)

References 35 publications

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“…To find the fatigue source of a mechanical product, a life-stress model can be incorporated with conventional design methods and relevant techniques to help identify the failure of electronic parts due to present material flaws or small cracks when the parts are subjected to (mechanical) stresses. Finite element methods (FEMs) may not identify the source of failure [28].…”

Section: Introductionmentioning

confidence: 99%

Reliability Design of Mechanical Systems Such as Compressor Subjected to Repetitive Stresses

Woo

O’Neal

2021

Metals

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This study demonstrates the use of parametric accelerated life testing (ALT) as a way to recognize design defects in mechanical products in creating a reliable quantitative (RQ) specification. It covers: (1) a system BX lifetime that X% of a product population fails, created on the parametric ALT scheme, (2) fatigue and redesign, (3) adapted ALTs with design alternations, and (4) an evaluation of whether the system design(s) acquires the objective BX lifetime. A life-stress model and a sample size formulation, therefore, are suggested. A refrigerator compressor is used to demonstrate this method. Compressors subjected to repetitive impact loading were failing in the field. To analyze the pressure loading of the compressor and carry out parametric ALT, a mass/energy balance on the vapor-compression cycle was examined. At the first ALT, the compressor failed due to a cracked or fractured suction reed valve made of Sandvik 20C carbon steel (1 wt% C, 0.25 wt% Si, 0.45 wt% Mn). The failure modes of the suction reed valves were similar to those valves returned from the field. The fatigue failure of the suction reed valves came from an overlap between the suction reed valve and the valve plate in combination with the repeated pressure loading. The problematic design was modified by the trespan dimensions, tumbling process, a ball peening, and brushing process for the valve plate. At the second ALT, the compressor locked due to the intrusion between the crankshaft and thrust washer. The corrective action plan specified to perform the heat treatment to the exterior of the crankshaft made of cast iron (0.45 wt% C, 0.25 wt% Si, 0.8 wt% Mn, 0.03 wt% P). After these design modifications, there were no troubles during the third ALT. The lifetime of the compressor was secured to have a B1 life of 10 years.

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Section: Introductionmentioning

confidence: 99%

Reliability Design of Mechanical Systems Such as Compressor Subjected to Repetitive Stresses

Woo

O’Neal

2021

Metals

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show abstract

“…To find the fatigue source of a mechanical product, a life-stress model can be used with traditional design procedures and related techniques to help identify the failure of electronic components due to material flaws or small cracks when the parts are subjected to (mechanical) stresses. Finite element methods (FEMs) may not identify the source of failure [22][23][24][25]. As an alternative, there are other methods such as structural health monitoring (SHM) that allow for the detection of the source of the failure [26].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Lifetime of the Pneumatic Cylinder in Automatic Assembly Line Subjected to Repeated Pressure Loading

Woo¹,

O’Neal

Hassen³

2021

Metals

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This study demonstrates the application of parametric accelerated life testing (ALT) as a procedure to identify design deficiencies and correct them in generating a reliable quantitative (RQ) specification. It includes: (1) a system BX lifetime that X% of a product population fails with a parametric ALT scheme, (2) fatigue design, (3) ALTs with alternations, and (4) judgement as to whether the design(s) secures the desired BX lifetime. A (generalized) life–stress model through the linear transport process and a sample size formulation are suggested. A pneumatic cylinder in a machine tool was used as a case study. The cylinder was failing in a flexible manufacturing system. To reproduce the failure and modify the design, a parametric ALT was performed. At the first ALT, the metal seal made of nickel-iron alloy (36% Ni) partially cracked and chipped and had a crisp metal sound. It was modified by changing the seal from a metal to a polymer (silicone rubber). At the second ALT, the piston seal leaked due to seal hardening and wear. The failure modes of the silicone seal in the laboratory tests were similar to those returned from the field. For the third ALT, the seal material was changed from silicone rubber to (thermoset) polyurethane. There were no concerns during the third ALT and the lifetime of the pneumatic cylinder was shown to have a B1 life of 10 years.

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Coupling Finite Element Method with Incremental Harmonic Balance Method for Analysis of Nonlinear Vibrations of Stepped Beams and Frames

Pušenjak¹,

Nikonov²

2023

Advanced Structured Materials

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FEM analysis of dispersive elastic waves in three-layered composite plates with high contrast properties

Cited by 8 publications

References 35 publications

Reliability Design of Mechanical Systems Such as Compressor Subjected to Repetitive Stresses

Reliability Design of Mechanical Systems Such as Compressor Subjected to Repetitive Stresses

Enhancing the Lifetime of the Pneumatic Cylinder in Automatic Assembly Line Subjected to Repeated Pressure Loading

Coupling Finite Element Method with Incremental Harmonic Balance Method for Analysis of Nonlinear Vibrations of Stepped Beams and Frames

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