scholarly journals Influence of the applied layer on the state of stress in a bimetallic perforated plate under two load variants

2021 ◽  
Vol 15 (56) ◽  
pp. 137-150
Author(s):  
Mateusz Konieczny ◽  
Grzegorz Gasiak ◽  
Henryk Achtelik
Keyword(s):  
Perforated Plate ◽  
Single Layer ◽  
External Pressure ◽  
The State ◽  
Von Mises Stress ◽  
Stress Tests ◽  
Concentrated Force ◽  
State Of Stress ◽  
Base Steel ◽  
Von Mises

The paper presents the results of the analysis of the influence of the applied plate layer on the state of stress in the bimetallic perforated plate. The finite element method ANSYS program was used for numerical calculations. The paper presents the results of stress tests for a single-layer clad plate made of S355J2 steel and a bimetallic perforated plate consisting of layers made of S355J2 steel and titanium. In addition, the study presents the results of the research on the influence of the method of loading, i.e. the concentrated force P in the geometric center of the plate and the external pressure q on the entire surface of the plate, and the method of support, i.e. free support and fixed, on the location of stress concentration zones in the bimetallic circular perforated plate. It has been shown that the presence of a perforated layer in the plate reduces the value of the equivalent von Mises stress by a minimum of approximately 30% in the base (steel) layer.

scholarly journals Experimental analysis of the state of stress in a steel – titanium perforated plate loaded with concentrated force

2020 ◽  
Vol 15 (55) ◽  
pp. 277-288
Author(s):  
Mateusz Konieczny ◽  
Grzegorz Gasiak ◽  
Henryk Achtelik
Keyword(s):  
Experimental Analysis ◽  
Maximum Stress ◽  
Ammonia Synthesis ◽  
Perforated Plate ◽  
The State ◽  
Von Mises Stress ◽  
Concentrated Force ◽  
State Of Stress ◽  
Plate Perforation ◽  
Von Mises

The paper presents an experimental analysis of the state of stress, free supported on the edge of a steel – titanium circular perforated plate loaded with a centrally concentrated force, created in the technological process of explosion welding. For this purpose, a special test stand was designed and a methodology for testing the perforated plate was developed. Resistance strain gauges were used to measure the state of strain. The load was applied in the center of the plate to a pressure stamp. As a result of the research, the values of radial, circumferential and equivalent von Mises stress were obtained as a function of the radius of the plate perforation circle and its load. The stress distribution topography revealed the zones of maximum stress of the steel – titanium perforated plate. The proposed method of experimental research can be used by engineers to verify the state of stress, e.g. in the designed tube sheet walls of reactors for ammonia synthesis.

scholarly journals Research of stress distribution in the cross-section of a bimetallic perforated plate perpendicularly loaded with concentrated force

2020 ◽  
Vol 15 (55) ◽  
pp. 241-257
Author(s):  
Mateusz Konieczny ◽  
Henryk Achtelik ◽  
Grzegorz Gasiak
Keyword(s):  
Stress Distribution ◽  
Plate Thickness ◽  
Perforated Plate ◽  
Von Mises Stress ◽  
Engineering Structures ◽  
Concentrated Force ◽  
Perforated Plates ◽  
Titanium Layer ◽  
The Difference ◽  
Von Mises

The paper presents the stress distribution along the plate thickness in a bimetallic steel – titanium circular, axially symmetrical perforated plate produced in the technological process of explosion welding. The steel layer is the layer that transfers the load in the plate, while the titanium layer is used to improve the properties of the plate, e.g. corrosion resistance, thermal transmittance, etc. in the plate. Two cases of fastening were considered, i.e. a freely supported and fixed plate. Such plates are used in various engineering structures, e.g. simply supported plates can be used in loose material screens, while plates are fixed in heat exchangers. The load was assumed as a concentrated force applied perpendicularly to the plate surface. The results obtained numerically using the finite element method were compared with the results calculated according to the analytical equations. It has been shown that the difference in the results of equivalent von Mises stress calculations does not exceed 13%. The research results presented in the paper can be used by engineers to design bimetallic perforated plates perpendicularly loaded to their surface.

Wellbore Integrity: An Integrated Experimental and Numerical Study to Investigate Pore Pressure Variation during Cement Hardening under Downhole Conditions

SPE Journal ◽  
2021 ◽  
pp. 1-16
Author(s):  
Weicheng Zhang ◽  
Andreas Eckert ◽  
Steven Hilgedick ◽  
Harvey Goodman ◽  
Meng Meng
Keyword(s):  
Pore Pressure ◽  
Numerical Study ◽  
Pressure Variation ◽  
The State ◽  
Numerical Results ◽  
Von Mises Stress ◽  
Fluid Loss ◽  
Wellbore Integrity ◽  
State Of Stress ◽  
Pressure Decrease

Summary Understanding the cement hardening process and determining the development of the state of stress in the cement under specific downhole conditions are challenging but fundamental requirements to perform an accurate prediction of wellbore integrity. As an essential component of the state of stress, the temporal variation of cement pore pressure is a critical factor that affects the occurrence of cement failure. In this study, we present a novel laboratory setup to measure the cement pore pressure variation during hardening under representative downhole conditions, including the pressure, temperature, and water exchange between the cement and formation. The pore pressure measurements are further incorporated with a staged finite element analysis (FEA) approach to investigate the state of stress development during cement hardening and to evaluate cement failure under different operations and after different wait-on-cement (WOC) periods. The laboratory measurements show that the external water supply from the formation significantly impedes the pore pressure drop in the cement. The numerical results indicate that the accelerated pore pressure decrease obtained without considering downhole conditions elevates the contact pressure at the cement-formation interfaces significantly and moderately increases the von Mises stress in the cement. The numerical results further predict that the accelerated pore pressure decrease leads to an overestimation of shear failure during pressure testing and steamflooding operations but an underestimation of debonding failure during severe fluid loss and injection-related cooling processes. Based on the results of the integrated laboratory and numerical approach, qualitative and quantitative suggestions are provided for field operations to inhibit wellbore integrity risk during the wellbore life cycle.

scholarly journals Research of Maximum Stress Zones in Circular Plates with Loades Concentrated Force

2020 ◽  
Vol 70 (2) ◽  
pp. 77-90
Author(s):  
Konieczny Mateusz ◽  
Achtelik Henryk ◽  
Gasiak Grzegorz
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Concentration ◽  
Maximum Stress ◽  
Perforated Plate ◽  
Chemical Equipment ◽  
Circular Plates ◽  
The Finite Element Method ◽  
Concentrated Force ◽  
State Of Stress

AbstractThe paper presents numerical and experimental analysis of the state of stress in a circular perforated plate, free supported or fixed on entire premier and loaded concentrated force. This type of plate have found applications in the field of chemical equipment, pressure tanks and box conveyors. The use of the finite element method for numerical calculations enables accurate location of stress concentration zones in a perforated plate and allows to determine stress values around these hole.

Estimation of Failure Parameters for Finite Element Simulations Based on a Single State of Stress and Arbitrary Stress-Strain Relation

2014 ◽  
Author(s):  
Lars O. Voormeeren ◽  
Carey L. Walters ◽  
Lisa Tang ◽  
Alex W. Vredeveldt
Keyword(s):  
Yield Condition ◽  
Failure Criteria ◽  
The State ◽  
Small Scale ◽  
Storage Tanks ◽  
Hardening Law ◽  
State Of Stress ◽  
Offshore Industry ◽  
Lng Fuel ◽  
Von Mises

Crash analysis in the maritime and offshore industry typically relies on failure criteria that are based only on uniaxial states of stress. However, it is well known that the failure strain depends on the state of stress, and the state of stress in ship collisions is not necessarily uniaxial. Although more detailed failure models are routine in other industries, the cost of finding the parameters for these models remains a barrier within the maritime and offshore industry. This paper explores an approach of applying the Modified Mohr-Coulomb (MMC) failure criterion based on a single tension test. This is based on the observation that there is only a single independent calibration parameters when a von Mises yield locus and plane stress are assumed. The MMC yield condition is also generalized by applying it to an arbitrary stress versus strain relationship, which does not follow the power hardening law. Results of impact tests on small-scale cryogenic storage tanks filled with water and air are presented and are used to validate the adjustments made above. This validation test also shows how the above findings can be applied to storage tanks for LNG fuel on inland waterway ships.

A Force Applied in the Median Plane at the Center of a Circular Insert in a Plate

1949 ◽  
Vol 16 (4) ◽  
pp. 411-413
Author(s):  
S. J. Dokos
Keyword(s):  
Elastic Properties ◽  
Median Plane ◽  
The State ◽  
Cylindrical Hole ◽  
Special Solution ◽  
Concentrated Force ◽  
State Of Stress ◽  
Approach Infinity

Abstract The problem to be considered in this paper is the determination of the state of stress in a plate containing a right, circular, cylindrical hole filled with a material of different elastic properties, subjected to a central concentrated force in the median plane of the plate. A special solution is also presented in which the modulus of rigidity of the insert is allowed to approach infinity such that no deformation occurs.

Effects of occlusal scheme on All-on-Four abutments, screws and prostheses: A three-dimensional finite element study

2020 ◽  
Author(s):  
Nurullah Türker ◽  
Hümeyra Tercanlı Alkış ◽  
Steven J Sadowsky ◽  
Ulviye Şebnem Büyükkaplan
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Good Prognosis ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Group Function ◽  
Occlusal Contact ◽  
Maximum Deformation ◽  
Contact Points ◽  
Von Mises

An ideal occlusal scheme plays an important role in a good prognosis of All-on-Four applications, as it does for other implant therapies, due to the potential impact of occlusal loads on implant prosthetic components. The aim of the present three-dimensional (3D) finite element analysis (FEA) study was to investigate the stresses on abutments, screws and prostheses that are generated by occlusal loads via different occlusal schemes in the All-on-Four concept. Three-dimensional models of the maxilla, mandible, implants, implant substructures and prostheses were designed according to the All-on-Four concept. Forces were applied from the occlusal contact points formed in maximum intercuspation and eccentric movements in canine guidance occlusion (CGO), group function occlusion (GFO) and lingualized occlusion (LO). The von Mises stress values for abutment and screws and deformation values for prostheses were obtained and results were evaluated comparatively. It was observed that the stresses on screws and abutments were more evenly distributed in GFO. Maximum deformation values for prosthesis were observed in the CFO model for lateral movement both in the maxilla and mandible. Within the limits of the present study, GFO may be suggested to reduce stresses on screws, abutments and prostheses in the All-on-Four concept.

The Influence of Loading Position in A Priori High Stress Detection using Mode Superposition

2020 ◽  
Vol 1 (1) ◽  
pp. 93-102
Author(s):  
Carsten Strzalka ◽  
◽  
Manfred Zehn ◽  
Keyword(s):  
Finite Element ◽  
Degrees Of Freedom ◽  
Equations Of Motion ◽  
A Priori ◽  
High Stress ◽  
Von Mises Stress ◽  
Detailed Knowledge ◽  
Variable Loading ◽  
Numerical Effort ◽  
Von Mises

For the analysis of structural components, the finite element method (FEM) has become the most widely applied tool for numerical stress- and subsequent durability analyses. In industrial application advanced FE-models result in high numbers of degrees of freedom, making dynamic analyses time-consuming and expensive. As detailed finite element models are necessary for accurate stress results, the resulting data and connected numerical effort from dynamic stress analysis can be high. For the reduction of that effort, sophisticated methods have been developed to limit numerical calculations and processing of data to only small fractions of the global model. Therefore, detailed knowledge of the position of a component’s highly stressed areas is of great advantage for any present or subsequent analysis steps. In this paper an efficient method for the a priori detection of highly stressed areas of force-excited components is presented, based on modal stress superposition. As the component’s dynamic response and corresponding stress is always a function of its excitation, special attention is paid to the influence of the loading position. Based on the frequency domain solution of the modally decoupled equations of motion, a coefficient for a priori weighted superposition of modal von Mises stress fields is developed and validated on a simply supported cantilever beam structure with variable loading positions. The proposed approach is then applied to a simplified industrial model of a twist beam rear axle.

Sign in / Sign up

Export Citation Format

Share Document