Digitalization of Components in Body Construction

2011 ◽  
Vol 4 (4) ◽  
pp. 10-15
Author(s):  
Dirk Kissinger
Keyword(s):  
Body Construction

scholarly journals INFLUENCE OF CREEP CONCRETE ON SPACE STABILITY THIN-WALLED DOME COVERINGS

2021 ◽  
Vol 1 (24) ◽  
Author(s):  
Ekaterina Prokshits ◽  
Sergey Gridnev ◽  
Olga Sotnikova ◽  
Iana Zolotukhina
Keyword(s):  
Theory Of Elasticity ◽  
Deformation Condition ◽  
Software Systems ◽  
Geometrical Parameters ◽  
Loss Of Stability ◽  
Construction Mechanics ◽  
Body Construction ◽  
Calculation Results ◽  
Load Action ◽  
Thin Walled

The task was set, due to the capabilities of modern software systems, to assess the effect of the increase in inelastic deformations under prolonged load action on the loss of stability of thin-walled dome coverings. The study of the dependences of the forms of the loss of stability of dome covering from creep concrete that will help further with optimization calculations when determining of the most influencing parameters of designs. Calculation results of thin-walled concrete dome roof of circular outline under the influence of operational loadings with use of two modern program complexes are given in article. It is investigated intense and deformation condition of dome coverings as a part of construction from position of forecasting of possible forms of loss of stability, with use of opportunities of the final and element «MidasCivil» computer system. In work provisions of the theory of elasticity, mechanics of deformation of solid body, construction mechanics and also methods of mathematical modeling based on application of finite element method are used. The received results give the chance to rationally select geometrical parameters and material of design and also to set structural strength safety factors at the solution of problems of stability of different covers taking into account possible creep of material.

scholarly journals Gambaran kadar limfosit pada pekerja bangunan

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
Dhea Tiara ◽  
Murniati Tiho ◽  
Yanti M. Mewo
Keyword(s):  
Physical Activity ◽  
Time Management ◽  
High Intensity ◽  
Sampling Technique ◽  
The Body ◽  
Construction Workers ◽  
Cross Sectional ◽  
Intensity Physical Activity ◽  
Body Construction ◽  
Cross Sectional Design

Abstract: Humans spend most of their time on activities. In this modern era, due to increasing competitiveness, everyone is demanded to work harder, causing an ineffective time management. The increase of activity can affect health if not accompanied with adequate rest. The increase of activity can affect physiological function that can cause stress to the body. When stress occured, sympathic nervous and adrenal gland will affect the body's immune system, one of them is lymphoid tissue. Physical activity with moderate to high intensity can cause a change of lymphocyte level in the body. Construction workers are one of the kind of high intensity physical activity. This study aimed to discover the description of lymphocyte level on construction workers. This study was conducted on August 2016 to December 2016. This study is a descriptive study with cross sectional design and the sampling technique was total sampling, 30 respondents were participating. The study result showed that lymphocyte level on 17 respondents (56,7%) was normal, 4 respondents (13,3%) had an elevated lymphocyte level and 9 respondents (30%) had a depressed lymphocyte level. Conclusion: This study result that most of the respondents had a normal lymphocyte level.Keywords: lymphocyte level, construction worker, physical activity. Abstrak: Manusia menghabiskan sebagian besar waktu untuk beraktivitas. Di era modern ini, karena tingkat persaingan semakin tinggi, setiap orang dituntut untuk bekerja lebih keras, sehingga menyebabkan orang tidak dapat mengatur waktu secara efektif. Peningkatan aktivitas dapat mempengaruhi kesehatan jika tidak disertai dengan istirahat yang cukup. Peningkatan aktivitas fisik dapat mempengaruhi fungsi fisiologi tubuh yang akhirnya akan menimbulkan stres pada tubuh. Pada saat terjadi stres, saraf simpatik dan kelenjar adrenal akan mempengaruhi sistem imun, salah satunya adalah jaringan limfoid. Aktivitas fisik dengan intensitas sedang sampai berat dapat menyebabkan perubahan jumlah limfosit dalam tubuh. Pekerja bangunan merupakan salah satu aktivitas fisik dengan intensitas berat. Penelitian ini bertujuan untuk mengetahui gambaran kadar limfosit pada pekerja bangunan. Penelitian ini dilakukan pada bulan Agustus 2016 sampai dengan Desember 2016. Penelitian ini merupakan penelitian deskriptif dengan desain penelitian cross-sectional dan pengambilan sampel secara total sampling dengan 30 orang responden. Dari hasil penelitian didapatkan bahwa gambaran kadar limfosit pada pekerja bangunan terdapat 17 responden (56,7%) memiliki kadar limfosit normal, 4 responden (13,3%) memiliki kadar limfosit meningkat dan 9 responden (30%) memiliki kadar limfosit menurun. Simpulan: Sebagian besar responden memiliki kadar limfosit normal. Kata kunci: kadar limfosit, pekerja bangunan, aktivitas fisik.

Friction Characterisation for a Tumbling Self-Piercing Riveting Process

2021 ◽  
Vol 883 ◽  
pp. 27-34
Author(s):  
Simon Wituschek ◽  
Michael Lechner
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Vehicle Design ◽  
Numerical Investigations ◽  
Process Route ◽  
Friction Factors ◽  
Material Systems ◽  
Body Construction ◽  
Riveting Process ◽  
The Individual

Due to increasing demands regarding ecological and economic specifications in vehicle design, the effort required for production is continuously increasing. One trend is the increased use of multi-material systems, which are characterised by the use of different materials such as high-strength steels or aluminium alloys. In addition to the varying mechanical properties of the components, an increased number of variants accompanied by different geometries is leading to increasing challenges on body construction. For the assembly and connection of the individual components, conventional joining methods reach their limitations. Therefore, new joining methods are necessary, which feature properties of versatility and can adapt to process and disturbance variables. One way of achieving tailored joints is to use a tumbling self-piercing riveting process. For the design of the process route, numerical investigations are necessary for which a characterisation of the friction properties is necessary. This paper therefore investigates the contact and friction conditions that occur in a tumbling self-piercing riveting process. The individual contacts between the process components are identified and based on this, suitable processes for the characterisation of the friction factors - and coefficients are selected and performed.

Bolt Strength in Sectional Body Construction of Valves

2019 ◽  
Author(s):  
Bhaskar Shitolé
Keyword(s):  
Rigid Bodies ◽  
Bolted Joints ◽  
Terminal Point ◽  
Piping System ◽  
Valve Body ◽  
Section Modulus ◽  
Creep Characteristics ◽  
Body Construction ◽  
Minimum Requirements ◽  
Body Joints

Abstract ASME B16.34-2017 Section 6.4.2 provides requirements for valves with bolted body joints and threaded body joints. The section states that valves with bodies of sectional construction such that bolted or threaded body joints are subject to piping mechanical loads in addition to the pressure rating for which the valve is designed, shall satisfy the following requirements. For bolted joints, the requirement is a simple formula where the product of pressure rating class designation and ratio of area bounded by the effective outside periphery of a gasket or O-ring or other seal-effective periphery and total effective bolt tensile stress area are less than a certain constant. For bolts of strength less than 137.9 MPa, the value of constant reduces as a multiple of 50.76 times the bolt tensile strength in MPa required or provided in a sectional construction. Section 6.4.3 cautions that the minimum requirements of ASME B16.34 may fall short in scenarios due to valve design, special gaskets, high temperature service, creep characteristics etc. This paper reviews and studies this ASME B16.34 requirement which was triggered by failure of a valve with section body construction in the field. Traditionally valves have been considered as rigid bodies when analyzing a piping system for stresses, support loads, terminal point loads and deflections. The rigid modelling assumes the strength of the valve is much higher than an equivalent straight length of pipe. Some computer programs have a provision that permits modeling the valve as a multiple like 3- or 4-times pipe section modulus. This paper compares the strength of piping and valves based on inherent valve body thickness, body sectional bolting provided and strength of the equivalent piping flanges. The paper makes conclusions for the user to be aware of so that pre-emptive actions can be taken when using valves with sectional body construction.

Tolerances and Measuring Strategies in the Virtual Process Chain for Spot Welded Structures; Substitute Modeling and Automating the Calibration Procedure

2015 ◽  
Vol 794 ◽  
pp. 3-10
Author(s):  
Patrick Ackert ◽  
Christian Schwarz ◽  
Reinhard Mauermann ◽  
Dirk Landgrebe
Keyword(s):  
Spot Welding ◽  
Computing Time ◽  
Numerical Procedure ◽  
Calibration Procedure ◽  
Welding Distortion ◽  
Process Chain ◽  
Welded Structures ◽  
Body Construction ◽  
Calibration Samples ◽  
Virtual Process

This paper presents a method with whose help it is possible, to quickly and precisely predict the influence that thermal spot-shaped joining processes has on the dimensional stability of complex component structures even in early planning phase. The welding distortion is calculated in the context of reduced computing time, based upon an experimentally calibrated mechanical substitute model. This expands existing approaches of substitute models and defines both an experimental and numerical procedure for creating adequate calibration samples. In turn, this makes use of the potential obt ained for standardizing the experimental basis for calculating and modelling the distortion to automatically carry out painstaking calibration processes in simulations and experiments in future based upon mathematical model functions. Finally, the limits to applying the substitute spot welding model are verified with reference to its predictability using a complex joining situation of a car body construction.

New Approach to High Rigidity Body Construction Using Dynamic Analysis

2003 ◽  
Author(s):  
Mikio Shibaoka ◽  
Kaoru Kusaka ◽  
Yasushi Nakanishi ◽  
Yoshiharu Itai
Keyword(s):  
Dynamic Analysis ◽  
New Approach ◽  
High Rigidity ◽  
Body Construction

GMC Motorhome Body Construction

1977 ◽  
Author(s):  
Lyn C. Hollis
Keyword(s):  
Body Construction
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