Thermomechanical Behavior of Multilayer Structures in Microelectronics

1990 ◽  
Vol 112 (1) ◽  
pp. 11-15 ◽  
Author(s):  
I. M. Daniel ◽  
T.-M. Wang ◽  
J. T. Gotro
Keyword(s):  
Thermal Properties ◽  
Elevated Temperature ◽  
Thermomechanical Behavior ◽  
Multilayer Structures ◽  
Mechanical And Thermal Properties ◽  
Stacking Sequence ◽  
Epoxy Material ◽  
Lamination Theory ◽  
Moire Method ◽  
Good Agreement

Linear thermoelastic lamination theory was used to determine the state of residual stresses and warpage in multilayer structures following elevated temperature curing. The inputs necessary are the mechanical and thermal properties of each layer, the stacking sequence of layers, and the irreversible chemical deformation taking place during curing of the polymeric matrix layers. The predictions were verified experimentally with a woven-glass/epoxy material. The basic mechanical and thermal properties and polymerization shrinkage were determined for the unidirectional layer. Subsequently, the warpage was measured for a [06/906] antisymmetric cross-ply laminate by means of the shadow moire´ method. Experimental results were in good agreement with the theoretical prediction.

The Effect of Phase Composition on the Mechanical and Thermal Properties of LTCC Material

2012 ◽  
Vol 2012 (CICMT) ◽  
pp. 000492-000497
Author(s):  
Kostja Makarovič ◽  
Anton Meden ◽  
Marko Hrovat ◽  
Janez Holc ◽  
Andreja Benčan ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Phase Composition ◽  
Flexural Strength ◽  
Mass Fraction ◽  
Major Change ◽  
Multilayer Structures ◽  
Propagation Mechanism ◽  
Mechanical And Thermal Properties ◽  
Thermal Coefficient ◽  
Biaxial Flexural Strength

Low-temperature co-fired ceramic (LTCC) is an important material in the production of ceramic multilayer structures. Large and complex multilayer structures are usually fired at higher temperatures and/or longer firing times compared to the relatively thin LTCC tapes. The firing conditions of LTCC determine the phase composition and the microstructure, which both influence the physical characteristics, such as the mechanical and thermal properties. In this work the effect of the phase composition on the biaxial flexural strength and the temperature coefficient of expansion of the DuPont 951 LTCC is presented. The samples were fired at different temperatures and times to obtain different phase compositions. The phase composition, especially the mass fraction of anorthite, was correlated with the biaxial flexural strength and the thermal coefficient of expansion (TCE). A very long firing time, i.e., 100h at 800 °C, yields, apart from crystalline anorthite, the cristobalite phase. The anorthite that crystalizes from the glass phase in a dense LTCC material changes the crack-propagation mechanism and improves the biaxial flexural strength of the material. The major change in the biaxial flexural strength is observed when the anorthite phase appeared. The increasing mass fraction of anorthite does improve the biaxial flexural strength less drastically. With the increasing mass fraction of the anorthite, decreases of the TCE of the material and a small decrease of the density of the LTCC material occur.

A Study on Comparison of Mechanical, Thermal Properties of High Strength Structural Steels at High Temperature

2014 ◽  
Vol 902 ◽  
pp. 3-6
Author(s):  
In Kyu Kwon
Keyword(s):  
Thermal Properties ◽  
High Temperature ◽  
Elevated Temperature ◽  
Fire Resistance ◽  
High Strength ◽  
Structural Steels ◽  
Mechanical And Thermal Properties ◽  
Protective Material ◽  
Eurocode 3 ◽  
Resistance Performance

As the strength of structural steels is increasing, the performance of fire resistance should be evaluated clearly and suggested. While their application has been expanded, the evaluation of the fire resistance is inclined to adopt that derived from ordinary strength steels. In order to compare the fire resistance performance of high strength structural steels at high temperature, databases such as mechanical and thermal properties at elevated temperature were compared with those of Eurocode 3. After comparison, it is recommended that the passive protective material is more needed than those for the ordinary strength structural steels to meet the fire resistance requirement.

Surface Warpage Measurement of Wood at Elevated Temperature by Shadow Moiré Method

2013 ◽  
Vol 303-306 ◽  
pp. 799-802
Author(s):  
Terry Yuan Fang Chen ◽  
Yu Sheng Chen
Keyword(s):  
Elevated Temperature ◽  
Room Temperature ◽  
Field Method ◽  
Test Results ◽  
Full Field ◽  
Contact Type ◽  
Shadow Moire ◽  
Shadow Moiré ◽  
Moire Method ◽  
Good Agreement

A full-field method to measure the surface warpage of wood plate at elevated temperature by phase-shifted shadow moiré method is presented. Test of the method on a cypress wood plate is demonstrated. A comparison of the test results at room temperature to the ones obtained by contact type sensor was made. A good agreement between them is shown. Further measurement of the plate warpage at elevated temperature reveals the warping behavior of wood plate.

Mechanical and thermal characterization of grafted PP-NCC nanocomposites

2019 ◽  
pp. 089270571987822
Author(s):  
Saud Aldajah ◽  
Mohammad Y Al-Haik ◽  
Waseem Siddique ◽  
Mohammad M Kabir ◽  
Yousef Haik
Keyword(s):  
Thermal Properties ◽  
Interfacial Adhesion ◽  
Thermal Characterization ◽  
Mechanical And Thermal Properties ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Three Point Bending ◽  
Twin Screw ◽  
Thermal Stability Of

This study reveals the enhancement of mechanical and thermal properties of maleic anhydride-grafted polypropylene (PP- g-MA) with the addition of nanocrystalline cellulose (NCC). A nanocomposite was manufactured by blending various percentages of PP, MA, and NCC nanoparticles by means of a twin-screw extruder. The influence of varying the percentages of NCC on the mechanical and thermal behavior of the nanocomposite was studied by performing three-point bending, nanoindentation, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and Fourier-transform infrared (FTIR) spectroscopy tests. The novelty of this study stems on the NCC nanoparticles and their ability to enhance the mechanical and thermal properties of PP. Three-point bending and nanoindentation tests revealed improvement in the mechanical properties in terms of strength, modulus, and hardness of the PP- g-MA nanocomposites as the addition of NCC increased. SEM showed homogeneity between the mixtures which proved the presence of interfacial adhesion between the PP- g-MA incorporated with NCC nanoparticles that was confirmed by the FTIR results. DSC and TGA measurements showed that the thermal stability of the nanocomposites was not compromised due to the addition of the coupling agent and reinforced nanoparticles.

Ta addition effects on the structure, mechanical and thermal properties of sputtered Hf-Ta-C film

2019 ◽  
Vol 45 (12) ◽  
pp. 15596-15602 ◽  
Author(s):  
Xinlei Gu ◽  
Lina Yang ◽  
Xiaorong Ma ◽  
Xuan Dai ◽  
Jia Wang ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Mechanical And Thermal Properties
Sign in / Sign up

Export Citation Format

Share Document