Observation under the gradually increasing cyclic loading of yielding region of the circular hole vicinity

2002 ◽  
Author(s):  
Kensuke Ichinose ◽  
Yuji Funamoto ◽  
Kenji Gomi ◽  
Kiyoshi Taniuchi ◽  
Katsumi Fukuda
Keyword(s):  
Cyclic Loading ◽  
Circular Hole ◽  
Increasing Cyclic Loading

An Experimental Study of Inhomogeneous Cyclic Plastic Deformation

2001 ◽  
Vol 123 (3) ◽  
pp. 274-280 ◽  
Author(s):  
Yanyao Jiang
Keyword(s):  
Plastic Deformation ◽  
Cyclic Loading ◽  
Small Strain ◽  
Local Deformation ◽  
Gage Section ◽  
Strain Gages ◽  
Cyclic Plastic ◽  
Symmetrical Loading ◽  
Increasing Cyclic Loading ◽  
Cyclic Plastic Deformation

A localized inhomogeneous cyclic plastic deformation phenomenon was experimentally investigated in a mild steel. Small strain gages were utilized to characterize the local deformation within the gage section and the gross deformation was measured with an extensometer. Both fully reversed symmetrical loading and asymmetrical loading with a mean stress were used in the cyclic experiments. Plastic deformation was initiated in local areas of the specimen and it propagated into the whole gage section in the specimen with increasing cyclic loading. The local inhomogeneous cyclic deformation was dependent on the loading magnitude and evolved with continued cyclic loading.

The observation under the gradually increase cyclic loading of yielding region of the circular hole vicinity

2002 ◽  
Vol 2002 (0) ◽  
pp. 385-386
Author(s):  
YUUJI FUNAMOTO ◽  
AKIHIRO WATANABE ◽  
KENJI GOMI ◽  
KENSUKE ICHINOSE
Keyword(s):  
Cyclic Loading ◽  
Circular Hole

scholarly journals Incremental analysis of the twoaxial loading of the platewith central circular hole: shakedown (accomodation), alternating plasticity,ratcheting

2017 ◽  
Vol 21 (3) ◽  
pp. 106-124
Author(s):  
V.A. Turkova
Keyword(s):  
Finite Element ◽  
Cyclic Loading ◽  
Circular Hole ◽  
Strain State ◽  
Direct Methods ◽  
Plastic Plate ◽  
Incremental Analysis ◽  
Finite Element Calculations ◽  
Cycle Loading

In the article the results of finite element calculations for the determination of stress-strain state of elasto-plastic plate with central circular hole which is under the action of cycle loading are presented. Incremental and direct methods of defining asymptotic behaviour of the structure: adaptability, alternating plas- ticility and progressive plastic flow are presented. In the package Simulia Abaqus incremental cyclic loading of samples with stress concentrators is performed.

scholarly journals Drill Penetration Injury to Extensor Tendons: A Biomechanical Analysis

Hand ◽  
2016 ◽  
Vol 12 (3) ◽  
pp. 301-306 ◽  
Author(s):  
Jared M. Mahylis ◽  
Anora K. Burwell ◽  
Laura Bonneau ◽  
Lynn M. Marshall ◽  
Adam J. Mirarchi
Keyword(s):  
Cyclic Loading ◽  
Plate Fixation ◽  
Extensor Tendon ◽  
Tendon Injury ◽  
Biomechanical Analysis ◽  
Extensor Pollicis Longus ◽  
Extensor Tendons ◽  
Fresh Frozen ◽  
Increasing Cyclic Loading ◽  
Extensor Carpi Radialis

Background: Little is known about extensor tendon failure following drill injury at the time of volar plate fixation. Our goals were to analyze extensor tendon injury following simulated drill penetration, and change in tendon displacement during cyclic loading following simulated drill penetration injury. Methods: Extensor pollicis longus (EPL) and extensor carpi radialis brevis (ECRB) tendons were harvested from 9 fresh frozen cadaveric arms. Eighteen EPL and 18 ECRB samples were created from harvested tendons. Drill penetration injury was performed in either a continuous or an oscillating mode. Injured tendons were subjected to 1200 cycles at 1- to 15-kg cyclic load at a frequency of 1 Hz, and analyzed for failure at drill sites and change in displacement throughout the testing cycle. Results: Ten EPL samples and 16 ECRB samples completed testing without failure. Tendon type (ECRB, EPL), mode of injury (continuous, oscillating), and location (proximal, distal) did not affect tendon displacement during loading. A single EPL tendon failed following continuous drill penetration injury. Extensor carpi radialis brevis samples had a mean change in displacement of 2.8 (standard deviation [SD]: 1.5 mm) and 5.9 mm (SD: 4.7 mm) for oscillating and continuous modes, respectively. Six EPL samples had a mean change in displacement of 4.7 (SD: 2.7 mm) and 4.3 mm (SD: 1.8 mm) for oscillating and continuous modes, respectively. Conclusions: Complete extensor tendon failure due to drill penetration was rare. Drill mode did not affect the degree of elongation. Increasing cyclic loading of extensor tendons after drill injury caused modest extensor tendon elongation.

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

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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