scholarly journals APPLICATION OF CAD FOR ANALYSIS OF STRENGTH CHARACTERISTICS OF PASSENGER CAR BODY STRUCTURES

2021 ◽  
Author(s):  
Svetlana Ashurkova
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Strength Characteristics ◽  
Cad Tools ◽  
Passenger Car ◽  
Design Models ◽  
Load Bearing ◽  
Car Body

The development of finite element design models of the passenger car body using modern CAD tools was carried out. An assessment of the strength, stability and fatigue life of the load-bearing structures of the passenger car body has been carried out.

scholarly journals SUBSTANTIATION OF DESIGN SOLUTIONS FOR PASSENGER CAR BODY BEARING STRUCTURES WITH PERFORATED REINFORCING ELEMENTS

2019 ◽  
Vol 2019 (6) ◽  
pp. 69-76
Author(s):  
Светлана Ашуркова ◽  
Svetlana Ashurkova ◽  
Дмитрий Антипин ◽  
Dmitriy Antipin
Keyword(s):  
Finite Element ◽  
Model Development ◽  
Element Model ◽  
Structure Design ◽  
The Body ◽  
Passenger Car ◽  
Design Models ◽  
Car Body ◽  
Body Design ◽  
Bearing Structure

As a method of investigations there is adopted a computer mathematical modeling based on the use of a finite element method. The choice of a type and perforation parameters is connected with the problem in the large array creation of bearing structure design models of passenger car bodies. The analysis of investigations carried out in the field of multi-variation computations has shown that the most efficient investigation method is a superelement reduction. Its use allows decreasing labor and time costs for the body design model development at the expense of the initial super-element with the perforation area for a new one. The appraisal of the procedure offered on the choice of a body efficient bearing structure with the perforated profiles is carried out by the example of the body of a domestic passenger car according to the criteria of strength and assurance of the highest weight reduction of a bearing structure. In the first stage of the work there are defined types and parameters of perforation possible for use in the structure. Finite element design models of car bodies are developed. On the basis of strength computation results the reinforcing elements of the structure are offered which have a margin safety for perforation application in them. Based on the analysis of car body bearing structure there is carried out a choice of an efficient unit of a finite element model which will be used as a super-element. In the next stage of the work there are developed and computed structures of car bodies with the perforation types under consideration and with the use of superelements. The computation results have shown that maximum design stresses of car bodies for all perforation types under consideration do not exceed legitimate values. As an efficient bearing structure of a passenger car body there is adopted a car body with the sixth type of perforation ensuring the largest decrease of structure metal intensity and satisfying strength requirements. The procedure developed can be used at designing modern bearing structures of passenger car bodies having improved technical and economic values.

SIMULATION OF LOADING OF THE BODY OF A DOUBLE-STOREY PASSENGER CAR IN A FOCAL FIRE WITH SPECIFIED CHARACTERISTICS

2020 ◽  
Author(s):  
Dmitriy Antipin ◽  
Mihail Bulychev ◽  
Gennadiy Petrov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Carrying Capacity ◽  
Thermal Loading ◽  
The Body ◽  
Finite Element Scheme ◽  
Passenger Car ◽  
Element Scheme ◽  
Car Body ◽  
Element Method

A simplified method has been developed for assessing the loading of the load-bearing systems of passenger cars under thermal loading with a fire spot with limited properties. A system of simplifications for realizing a combustion spot is substantiated. A method for its implementation is proposed. The description of the object of research is given with the necessary thoroughness of presentation. A finite element scheme has been developed and adapted, taking into account the application of thermal loads in the system of an industrial software complex that implements the finite element method. Verification of the finite element scheme was carried out taking into account full-scale normative experiments. A conclusion is made about the possibility of the applicability of the finite element scheme for the study. Numerical experiments have been carried out to assess the carrying capacity of the body of a double-deck passenger car when it is exposed to a combustion center with known thermal parameters. The experiments were built and performed in a finite element method system. The results of simulations in the affected zone of the alleged fire were obtained for the conditional spot of its location. Comparison of the results with the static loading mode of the car body is considered. The analysis of the results obtained is carried out. A conclusion is given on the effect of a small localization fire on the carrying capacity of the car body. The proposed method is evaluated taking into account the possibility of further use

JUSTIFICATION OF TECHNIQUE FOR COMFORT AND SAFETY ANALYSIS AT PASSENGER TRANSPORTATION ON VIBRATION LOAD DECREASE OF PASSENGER CAR BODY

2021 ◽  
Vol 2021 (2) ◽  
pp. 44-50
Author(s):  
Dmitriy Antipin ◽  
Elena Lukashova ◽  
Pavel Zhirov
Keyword(s):  
Finite Element ◽  
Metal Structure ◽  
Comfort Level ◽  
Passenger Car ◽  
Body Vibration ◽  
Passenger Comfort ◽  
Vibration Load ◽  
Car Body ◽  
Passenger Transportation ◽  
The Impact

The purpose of the work is to increase comfort and safety of railway passenger transportation, at the expense of passenger car body vibration load decrease. The analysis of the investigations carried out and dedicated to the definition of rigidity property impact upon the level of passenger comfort and traffic safety has shown that the first mode of vertical bending impacts considerably upon car body dynamic behavior. The analysis of vibration load impact upon passenger car body was carried out in accordance with Dumitriu’s technique. As apposed to the investigations carried out earlier in the paper the data on car metal structure acceleration are obtained through the methods of mathematical modeling based on solid and finite element models. On the basis of the data obtained and natural running tests there was created and verified a particularized lamellar finite-element model of a car body with the aid of which there were obtained values of vertical and horizontal accelerations of a car body metal structure. The analysis of the results obtained has shown that within the frequency range of 8.9. – 20 Hz there are observed acceleration surges which are among the most sensitive ones in terms of the impact upon man and transport comfort support. At the frequencies obtained there was carried out a passenger comfort investigation with the aid of which it was defined that at the frequency of car body own bending oscillations of 8.9 Hz – a comfort index is above 4 units that shows a low comfort level. A frequency of 8.9 Hz corresponds to a vertical bending mode which is the most significant mode of car body deformation in terms of passenger comfort support. With regard to this in the works there was offered a number of efficient measures for strengthening car body structure bearing capacity with the goal of its bending rigidity increase which provides an installation of a supplementary bearing partition in the mid-section of a car body, and also the introduction of auxiliary longitudinal elements in a frame supporting design. For the effectiveness assessment of measures offered there was carried out re-investigation according to the technique described. As a result of the computation it was defined that the design measures offered allowed increasing a frequency value of own bending vibration of car body metal structure up to 11.7 Hz. The analysis of the results obtained allowed drawing a conclusion of the effectiveness of design solutions offered on car body vibration load decrease.

scholarly journals FATIGUE LIFE PREDICTION OF BEARING STRUCTURE OF PASSENGER CAR BODY WITH PERFORATED SUPPORTING ELEMENTS

2019 ◽  
Vol 2019 (7) ◽  
pp. 59-65
Author(s):  
Дмитрий Антипин ◽  
Dmitriy Antipin ◽  
Светлана Ашуркова ◽  
Svetlana Ashurkova
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
The Body ◽  
Fatigue Life Prediction ◽  
Life Assessment ◽  
Design Strength ◽  
Passenger Car ◽  
Car Body ◽  
Fatigue Life Assessment ◽  
Bearing Structure

The purpose of the work is a fatigue life assessment for bearing structures of passenger car bodies with perforated supporting elements through the methods of computer mathematical modeling. The fulfilled analysis of investigations in the field of the fatigue life assessment for welded bearing structures of car bodies has shown that its assessment should be carried out in a dynamic setting with the development of a spatial dynamic model of a car body. The fatigue life assessment in the most loaded areas of perforated supporting elements in car bodies was carried out with the use of two procedures: Serensen-Kogaev procedure and Bolotin one. There are considered ten versions of supporting element perforation in a passenger car body. The development of finite element models of car bodies with the mentioned options is carried out by the example of the body of a domestic passenger car. On the basis of the design strength computation results there are defined three most loaded areas of perforated supporting elements. The refined assessment of a dynamic stressed state of the areas under investigations is carried out through the method of an area successive accentuation. As a result of the investigation there are obtained life values of the most loaded areas for a passenger car body bearing structure for all perforation options under consideration. The results obtained confirm passenger car operation safety with the offered option of perforation and are evidence of the purposefulness in the application of the procedure offered for the fatigue life prediction of similar bearing structures.

scholarly journals Fatigue Crack Growth Analysis with Extended Finite Element for 3D Linear Elastic Material

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 397
Author(s):  
Yahya Ali Fageehi
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Fatigue Life ◽  
Crack Propagation ◽  
Crack Growth ◽  
Mixed Mode ◽  
Propagation Path ◽  
Loading Conditions ◽  
Extended Finite Element ◽  
Linear Elastic

This paper presents computational modeling of a crack growth path under mixed-mode loadings in linear elastic materials and investigates the influence of a hole on both fatigue crack propagation and fatigue life when subjected to constant amplitude loading conditions. Though the crack propagation is inevitable, the simulation specified the crack propagation path such that the critical structure domain was not exceeded. ANSYS Mechanical APDL 19.2 was introduced with the aid of a new feature in ANSYS: Smart Crack growth technology. It predicts the propagation direction and subsequent fatigue life for structural components using the extended finite element method (XFEM). The Paris law model was used to evaluate the mixed-mode fatigue life for both a modified four-point bending beam and a cracked plate with three holes under the linear elastic fracture mechanics (LEFM) assumption. Precise estimates of the stress intensity factors (SIFs), the trajectory of crack growth, and the fatigue life by an incremental crack propagation analysis were recorded. The findings of this analysis are confirmed in published works in terms of crack propagation trajectories under mixed-mode loading conditions.

scholarly journals Testing Crack Resistance of Non-Load-Bearing Ceramic Walls with Door Openings

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1379
Author(s):  
Tomasz Kania ◽  
Valery Derkach ◽  
Rafał Nowak
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Building Structure ◽  
The Finite Element Method ◽  
Short Term ◽  
Load Bearing ◽  
Door Opening ◽  
Partition Walls ◽  
Internal Partition ◽  
New Buildings

Cracking in non-load-bearing internal partition walls is a serious problem that frequently occurs in new buildings within the short term after putting them into service or even before completion of construction. Sometimes, it is so considerable that it cannot be accepted by the occupiers. The article presents tests of cracking in ceramic walls with a door opening connected in a rigid and flexible way along vertical edges. The first analyzes were conducted using the finite element method (FEM), and afterward, the measurements of deformations and stresses in walls on deflecting floors were performed on a full scale in the actual building structure. The measurements enabled to determine floor deformations leading to cracking of walls and to establish a dependency between the values of tensile stresses within the area of the door opening corners and their location along the length of walls and type of vertical connection with the structure.

scholarly journals An Optimum Fatigue Design of Polymer Composite Compressed Natural Gas Tank Using Hybrid Finite Element-Response Surface Methods

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 483
Author(s):  
Kazem Reza Kashyzadeh ◽  
Seyed Saeid Rahimian Koloor ◽  
Mostafa Omidi Bidgoli ◽  
Michal Petrů ◽  
Alireza Amiri Asfarjani
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Natural Gas ◽  
Response Surface ◽  
Polymer Composite ◽  
Wall Thickness ◽  
Composite Shell ◽  
Compressed Natural Gas ◽  
Fiber Angle ◽  
Composite Tank

The main purpose of this research is to design a high-fatigue performance hoop wrapped compressed natural gas (CNG) composite cylinder. To this end, an optimization algorithm was presented as a combination of finite element simulation (FES) and response surface analysis (RSA). The geometrical model was prepared as a variable wall-thickness following the experimental measurements. Next, transient dynamic analysis was performed subjected to the refueling process, including the minimum and maximum internal pressures of 20 and 200 bar, respectively. The time histories of stress tensor components were extracted in the critical region. Furthermore, RSA was utilized to investigate the interaction effects of various polymer composite shell manufacturing process parameters (thickness and fiber angle) on the fatigue life of polymer composite CNG pressure tank (type-4). In the optimization procedure, four parameters including wall-thickness of the composite shell in three different sections of the CNG tank and fiber angle were considered as input variables. In addition, the maximum principal stress of the component was considered as the objective function. Eventually, the fatigue life of the polymer composite tank was calculated using stress-based failure criterion. The results indicated that the proposed new design (applying optimal parameters) leads to improve the fatigue life of the polymer composite tank with polyethylene liner about 2.4 times in comparison with the initial design.

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