Thermo-Mechanical Behavior of Fire Protection Boards

2021 ◽  
Vol 325 ◽  
pp. 209-214
Author(s):  
Ulrich Diederichs ◽  
Sandra Jäntsch ◽  
Dorothea Sklenářová
Keyword(s):  
Thermal Expansion ◽  
Thermal Behavior ◽  
Fire Protection ◽  
Thermal Loading ◽  
Sheet Steel ◽  
Perforated Plate ◽  
Simultaneous Thermal Analysis ◽  
Road Tunnel ◽  
Mechanical Loads ◽  
Steel Sheets

In the course of the repair and fire protection upgrading of an approx. 1100 m long road tunnel in Hamburg, the eleven crossings of fire protection channels were covered with sheet steel to prevent the nesting of pigeons. In this context, the mechanical strains that may occur in the event of a fire had to be determined. In particular, it was necessary to clarify which mechanical loads would result from relative movements between the substrate (fire protection board) and the cover sheets due to their different thermal expansion in case of fire. For this purpose, the thermal behavior of the CSH fire protection board was determined by means of simultaneous thermal analysis and dilatometry, and the mechanical and thermal behavior of the composite construction was studied. The studies revealed that due to the facts that thermal expansion of the both materials and due to the softening of the fire protection panel the restraint that is generated by the screwed-on perforated plate in the vicinity of the screw shafts remains low during thermal loading. As a result, the top plate does not crack or break off, which means that screwing on the perforated steel sheets not negatively affects the fire protection of the panels.

scholarly journals The Performance of CR180IF and DP600 Laser Welded Steel Sheets under Different Strain Rates

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1553
Author(s):  
Mária Mihaliková ◽  
Kristína Zgodavová ◽  
Peter Bober ◽  
Anna Špegárová
Keyword(s):  
Sheet Steel ◽  
Testing Machine ◽  
Dynamic Test ◽  
Tensile Tests ◽  
Joint Surface ◽  
Strain Rates ◽  
Interstitial Free ◽  
Welded Steel ◽  
Steel Sheets ◽  
Static Tensile

The presented research background is a car body manufacturer’s request to test the car body’s components welded from dissimilar steel sheets. In view of the vehicle crew’s protection, it is necessary to study the static and dynamic behavior of welded steels. Therefore, the influence of laser welding on the mechanical and dynamical properties, microstructure, microhardness, and welded joint surface roughness of interstitial free CR180IF and dual-phase DP600 steels were investigated. Static tensile tests were carried out by using testing machine Zwick 1387, and dynamic test used rotary hammer machine RSO. Sheet steel was tested at different strain rates ranging from 10−3 to 103 s−1. The laser welds’ microstructure and microhardness were evaluated in the base metal, heat-affected zone, and fusion zone. The comprehensive analysis also included chemical analysis, fracture surface analysis, and roughness measurement. The research results showed that the strain rate had an influence on the mechanical properties of base materials and welded joints. The dynamic loading increases the yield stress more than the ultimate tensile strength for the monitored steels, while the most significant increase was recorded for the welded material.

Role of Out-of-Plane Coefficient of Thermal Expansion in Electronic Packaging Modeling

1999 ◽  
Vol 122 (2) ◽  
pp. 121-127 ◽  
Author(s):  
Manjula N. Variyam ◽  
Weidong Xie ◽  
Suresh K. Sitaraman
Keyword(s):  
Thermal Expansion ◽  
Electronic Packaging ◽  
Thermal Loading ◽  
Coefficient Of Thermal Expansion ◽  
Plane Deformation ◽  
Three Dimensional ◽  
Dissimilar Materials ◽  
3D Models ◽  
Material Behavior ◽  
Element Analysis

Components in electronic packaging structures are of different dimensions and are made of dissimilar materials that typically have time, temperature, and direction-dependent thermo-mechanical properties. Due to the complexity in geometry, material behavior, and thermal loading patterns, finite-element analysis (FEA) is often used to study the thermo-mechanical behavior of electronic packaging structures. For computational reasons, researchers often use two-dimensional (2D) models instead of three-dimensional (3D) models. Although 2D models are computationally efficient, they could provide misleading results, particularly under thermal loading. The focus of this paper is to compare the results from various 2D, 3D, and generalized plane-deformation strip models and recommend a suitable modeling procedure. Particular emphasis is placed to understand how the third-direction coefficient of thermal expansion (CTE) influences the warpage and the stress results predicted by 2D models under thermal loading. It is seen that the generalized plane-deformation strip models are the best compromise between the 2D and 3D models. Suitable analytical formulations have also been developed to corroborate the findings from the study. [S1043-7398(00)01402-X]

Thermal Behavior of an Intumescent Alkaline Aluminosilicate Composite Material for Fire Protection of Structural Elements

2019 ◽  
Vol 31 (6) ◽  
pp. 04019058 ◽  
Author(s):  
Konstantinos Sotiriadis ◽  
Sergii G. Guzii ◽  
Petra Mácová ◽  
Alberto Viani ◽  
Karel Dvořák ◽  
...  
Keyword(s):  
Composite Material ◽  
Thermal Behavior ◽  
Fire Protection ◽  
Structural Elements

Analysis of thermal expansion in elastic and elastoplastic layers subjected to cyclic thermal loading

2010 ◽  
Vol 50 (9-11) ◽  
pp. 1626-1630 ◽  
Author(s):  
K. Wada ◽  
Y. Yagi ◽  
I. Nakagawa ◽  
T. Atsumi ◽  
N. Ohno
Keyword(s):  
Thermal Expansion ◽  
Thermal Loading ◽  
Cyclic Thermal Loading

Geometric Modeling of Objects’ Thermal Characteristics by the Functional-Voxel Method

2020 ◽  
Vol 8 (1) ◽  
pp. 25-32 ◽  
Author(s):  
A. Plaksin ◽  
S. Pushkarev
Keyword(s):  
Thermal Expansion ◽  
Heat Source ◽  
Temperature Stress ◽  
Geometric Modeling ◽  
Thermal Loading ◽  
Geometric Model ◽  
The Body ◽  
Heat Conducting ◽  
Voxel Representation ◽  
Traditional Approaches

In this paper the influence of objects’ thermal processes on their correspondence to a given geometry has been considered, and an alternative apparatus for geometric modeling of bodies’ temperature stress and thermal expansion after effect of a heat source, based on a functional-voxel approach, has been proposed as well. A discrete geometric model of temperature stress at a point of thermal loading in an isotropic heat-conducting body for a functional-voxel representation has been developed, allowing simulate a single action of a heat source to obtain local geometric characteristics of thermal stress in the body. This approach, unlike traditional approaches based on the FEM, allows apply the temperature load at the object’s point taken by itself. A discrete geometric model for expansion at the point of thermal loading in an isotropic heat-conducting body for a functional-voxel representation has been developed, which allows simulate the change of an object’s local geometric characteristics during the process of material expansion from a single effect of a heat source to obtain a value upon the body volume changing. This approach, unlike traditional approaches based on the FEM, allows simulate a change in the body’s surface geometry from thermal expansion at a point taken by itself without errors arising from calculations using a mesh. Have been proposed algorithms for functional-voxel modeling of temperature stress and expansion under distributed thermal loading. These algorithms allow construct a loading region of complex configuration based on the spatial distribution and scaling of the temperature stress’s geometric model for a single point of thermal loading, uniformly form a contour (surface) after material expansion, and obtain information about the change in products’ length (volume) based on information about each point of functional space. Has been presented an example of using the proposed approach for solving a processing tool’s correction problem based on the temperature in the cutting zone and material thermal reaction. The geometric model can be used to the automated design of a processing tool path for parts cutting on CNC machines.

Behavior of Interface Pressure Distribution in a Single Bolt-Flange Assembly Subjected to Heat Flux

1992 ◽  
Vol 114 (2) ◽  
pp. 231-236 ◽  
Author(s):  
S. Itoh ◽  
Y. Shiina ◽  
Y. Ito
Keyword(s):  
Heat Flux ◽  
Thermal Behavior ◽  
Pressure Distribution ◽  
Thermal Loading ◽  
Thermal Contact ◽  
Bolted Joint ◽  
Interface Pressure ◽  
Short Period ◽  
Series Of Experiments ◽  
Axial Heat

This paper describes the thermal behavior of a single bolt-flange assembly, emphasizing the correlation between the thermal contact resistance, thermal deformation of joint surroundings and interface pressure distribution, i.e., mechanically-thermally closed loop effect. Through a series of experiments, the major findings are as follows: (1) The thermal behavior of the bolted joint is dependent upon the sinusoidal-like distribution of the interface pressure, for instance, it showing the additional heat flow in radial direction under the axial heat flux. (2) The bolted joint with ordinarily geometric specification is in thermal stability except for a short period after thermal loading.

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