scholarly journals Redesigning and Manufacturing of a Land Levelling Shovel by Assembly Structural Stress Analysis

2014 ◽  
Vol 6 ◽  
pp. 235687 ◽  
Author(s):  
Tahir Altinbalik ◽  
Gürkan İrsel
Keyword(s):  
Stress Analysis ◽  
Maximum Stress ◽  
Stress Conditions ◽  
Present Condition ◽  
Structural Stress ◽  
Loading Conditions ◽  
Design Studies ◽  
Connection System ◽  
New Construction ◽  
Bolt Connection

The aim was to redesign and manufacture of a shovel for a pull-type land levelling machine, which, in its present condition, is used to get easily damaged even under low loads. Firstly, the maximum pulling load affecting the levelling shovel was experimentally determined. Then, stable-shovel system with the bolt connection was replaced with a bearing-shaft connection system. In this way, the new shovel has gained a capability of making oscillation motion so that it can operate on sloped grounds. CATIA program was used in the design studies. The shovel system was investigated by assembly structural stress analyses. This new construction enabled the system to operate 3 times more securely at maximum stress conditions without changing the levelling shovel material. Thus, it is managed to prevent any possible damages that might occur due to maximum loading conditions of the system. Besides, displacements that occur on the shovel decreased at the rate of 90%.

scholarly journals STRESS ANALYSIS OF INDIGENOUSLY DESIGNED ENERGY STORING POLYPROPYLENE CO-POLYMER (PPCP) PROSTHETIC FOOT

2020 ◽  
pp. 1-3
Author(s):  
Sachin S Bhagat ◽  
A.G Indalkar ◽  
Avinash Phirke
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Stress Analysis ◽  
Maximum Stress ◽  
Element Model ◽  
Heel Strike ◽  
Loading Conditions ◽  
Design Modification ◽  
Prosthetic Foot ◽  
Von Mises

Polypropylene Co-polymer (PPCP) Prosthetic Foot Model, Indigenously designed at All India Institute of Physical Medicine and Rehabilitation (AIIPMR), Mumbai. More commonly, this design is known as Modified Flex foot. Various researcher’s contributed towards its design modification, material optimization, patient trial & clinical implications and further improvements. As such, this study was conducted to observe & understand the stress analysis of this modified flexfoot under loading conditions at various orientation of gait. Finite element analysis (FEA) method was used with Ansys 12.0 software. Study objectives was to construct and analyze the finite element model, to find out & understand failure prone areas in the present design of PPCP prosthetic foot. This study was conducted into five phases. At initial phase, actual foot design was constructed and input parameters like geometrical parameters were calculated considering the standard length transtibial amputee. Similarly Material properties, loading conditions & boundary conditions were determined. AutCAD model was constructed using input parametrs & imported into Ansys 12.0 software. Finite element model were constructed and analyzed. Results were noted, which were displyed in the form of several contour plots & through colours that correspond to different stress values. FEA results obtained for various stress values like, Elemental stress, shearing stress & Von Mises stresses (Combination stresses). Peak Von Mises stress value of 28112 Mpa, observed at lower ankle fillet region during heel strike orientation of the gait. Study concluded that lower ankle fillet region & Midfoot spring region will be subjected to maximum stress during heel strike, Mid stance & push off. It was concluded that lower ankle fillet region & Midfoot spring region will be subjected to maximum stress during heel strike, Mid stance & push off.

Strength-based design of a sunflower stalk cutter machine design using finite element analysis and experimental validation

2021 ◽  
pp. 095440622110597
Author(s):  
Gürkan İrsel
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Analysis ◽  
Strain Gage ◽  
Experimental Validation ◽  
Experimental Studies ◽  
Fatigue Analysis ◽  
Structural Stress ◽  
Element Analysis ◽  
Strength Based

In this study, the total algorithm of the strength-based design of the system for mass production has been developed. The proposed algorithm, which includes numerical, analytical, and experimental studies, was implemented through a case study on the strength-based structural design and fatigue analysis of a tractor-mounted sunflower stalk cutting machine (SSCM). The proposed algorithm consists of a systematic engineering approach, material selection and testing, design of the mass criteria suitability, structural stress analysis, computer-aided engineering (CAE), prototype production, experimental validation studies, fatigue calculation based on an FE model and experimental studies (CAE-based fatigue analysis), and an optimization process aimed at minimum weight. Approximately 85% of the system was designed using standard commercially available cross-section beams and elements using the proposed algorithm. The prototype was produced, and an HBM data acquisition system was used to collect the strain gage output. The prototype produced was successful in terms of functionality. Two- and three-dimensional mixed models were used in the structural analysis solution. The structural stress analysis and experimental results with a strain gage were 94.48% compatible in this study. It was determined using nCode DesignLife software that fatigue damage did not occur in the system using the finite element analysis (FEA) and experimental data. The SSCM design adopted a multi-objective genetic algorithm (MOGA) methodology for optimization with ANSYS. With the optimization solved from 422 iterations, a maximum stress value of 57.65 MPa was determined, and a 97.72 kg material was saved compared to the prototype. This study provides a useful methodology for experimental and advanced CAE techniques, especially for further study on complex stress, strain, and fatigue analysis of new systematic designs desired to have an optimum weight to strength ratio.

scholarly journals Effect of Bolt-Hole Clearance on Bolted Connection Behavior for Pultruded Fiber-Reinforced Polymer Structural Plastic Members

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Sang-Pyuk Woo ◽  
Sun-Hee Kim ◽  
Soon-Jong Yoon ◽  
Wonchang Choi
Keyword(s):  
Failure Modes ◽  
Fiber Reinforced Polymer ◽  
Structural Members ◽  
Fiber Reinforced ◽  
Cross Sectional ◽  
Bolted Connection ◽  
Reinforced Polymer ◽  
Connection System ◽  
Structural Plastic ◽  
Bolt Connection

Bolt-hole clearance affects the failure mode on the bolted connection system of pultruded fiber-reinforced polymer plastic (PFRP) members. The various geometric parameters, such as the shape and cross-sectional area of the structural members, commonly reported in many references were used to validate the bolt-hole clearance. This study investigates the effects of the bolt-hole clearance in single-bolt connections of PFRP structural members. Single-bolt connection tests were planned using different bolt-hole clearances (e.g., tight-fit and clearances of 0.5 mm to 3.0 mm with 0.5 mm intervals) and uniaxial tension is applied on the test specimens. Most of the specimens failed in two sequential failure modes: bearing failure occurred and the shear-out failure followed. Test results on the bolt-hole clearances are compared with results in the previous research.

Finite Element Stress Analysis of Intersection Region of Nozzle and Blind Flange

2012 ◽  
Vol 605-607 ◽  
pp. 1307-1310
Author(s):  
Jun Hua Dong ◽  
Bing Jun Gao
Keyword(s):  
Finite Element ◽  
Stress Intensity ◽  
Stress Analysis ◽  
Maximum Stress ◽  
Stress Variation ◽  
Finite Element Stress Analysis ◽  
Maximum Stress Intensity ◽  
Variation Rule ◽  
Finite Element Stress

The stress analysis of the intersections region of nozzle & blind flange is implemented by means of FEA. The stress variation rule was obtained and the maximum Stress intensity is at the inside of intersections region of nozzle & blind flange. In accordance with JB4732-1995 (2005 Confirmed edition), the safety of structure was evaluated. The results show that the dimensiom given in the paper can meet the requirement for safety.

Modeling and structural stress analysis of thrust bearings

2019 ◽  
Vol 18 ◽  
pp. 2163-2171
Author(s):  
K. Venkata Saikiran Raju ◽  
G. Thammi Raju ◽  
N. Harsha
Keyword(s):  
Stress Analysis ◽  
Structural Stress ◽  
Thrust Bearings

Failure Investigation of the Disc Harrow Profiles and Redesigning by CATIA Analysis

2015 ◽  
Vol 729 ◽  
pp. 181-186 ◽  
Author(s):  
Gürkan Irsel ◽  
Tahir Altinbalik ◽  
Yilmaz Can
Keyword(s):  
Stress Analysis ◽  
Agricultural Sector ◽  
Design System ◽  
Structural Stress ◽  
System Construction ◽  
Engineering Analysis ◽  
Finite Element Stress Analysis ◽  
Failure Investigation ◽  
Applied Study ◽  
Present Design

This article covers an applied study on the computer-aided engineering analysis of the damage occurring in the disc bearing profiles of a disc harrow used in the agricultural sector and redesigning the existing structure.The damage to the machine had occurred in the form of deformation of the plastic structure in the disk-bearing profiles. In order to examine the damage, to collect information on the stress values causing the damage and to re-arrange the damaged design, system construction was modeled with CATIA and structural stress analysis was performed. Results of finite element stress analysis revealed weak regions of the construction under the variable dynamic loading, and the strength with inadequate and improper distribution was determined. Design goals aiming to improve present design were defined in order to prevent the occurrence of damage, and a design meeting these objectives was obtained. The existing system profiles and links were re-arranged in accordance with this design. Then, an experimental analysis consisting of 250 hours of operation was also performed with these new arrangements. No damage occurrence was observed in the new design, so the validity of the design was confirmed.

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