Asked in College Applications and Entrance RequirementsPhysicsCivil Engineering
College Applications and Entrance Requirements
How can material with high or low coiefficient of thermal expansion effect design of roof gutter?
January 22, 2008 9:52PM
How can material with high or low coiefficient of thermal expansion effect design of roof gutter?" How can material with high or low coiefficient of thermal expansion effect design of roof gutter?"
Asked in Physics
Why mechanical properties of solid important for design of machines and structures?
Asked in Math and Arithmetic
Why do engineers design city sidewalks using blocks of concrete separated by a small gap to prevent them from cracking?
When molecules move closer together in a bridge during winter how does a bridge not break from the molecules coming closer together?
Different between thermal and thermodynamics?
Asked in Google
How does culture technology and material influence the shape the design?
What Types of equipment use thermal overload protection?
Asked in Science
How do handmade thermometers work?
Asked in Manufacturing
What is the dilemma between design and manufacturing in terms of mechanical properties?
Asked in Solar Power
Will a metal coil filled with antifreeze help a solar cooker?
Asked in Physics, Mechanical Engineering
What is Thermal expansion coefficient of plastic?
The coefficient of linear thermal expansion measures the change in length per unit length of a material per unit change in temperature. Expressed as in/in/°F or cm/cm/°C, the CLTE is used to calculate the dimensional change resulting from thermal expansion. CLTE is especially important when components of an assembly have widely varying thermal expansion coefficients. Thermal expansion of a material is another important design factor, particularly in applications where plastic parts composed of Bayblend ET1000 resin are mated with metal parts or parts having metal inserts. Coefficient of linear thermal expansion was measured on injection molded samples according to ASTM D 696. Injection molding of these samples provided better consistency on repeat testing than values from sheet-extruded samples, though the numbers were close. Molding under ISO conditions minimizes molded-in orientation and results in more accurate values. Material in/in/°F x 10-5 cm/cm/°C x 10-5 Liquid Crystal (glass reinforced) 0.3 0.6 Polycarbonate (glass reinforced) 1.2 2.2 Nylon (glass reinforced) 1.3 2.3 TP Polyester (glass reinforced) 1.4 2.5 ABS (glass reinforced) 1.7 3.1 Polypropylene (glass reinforced) 1.8 3.2 Epoxy (glass reinforced) 2.0 3.6 Polyphenylene sulfide (glass reinforced) 2.0 3.6 Acetal (glass reinforced) 2.2 4.0 Epoxy 3.0 5.4 Polycarbonate 3.6 6.5 Acrylic 3.8 6.8 ABS 4.0 7.2 Nylon 4.5 8.1 Acetal 4.8 8.5 Polypropylene 4.8 (.000048) 8.6 TP Polyester 6.9 12.4 Polyethylene 7.2 13.0 Note: Above table factors are averaged for a given plastic type; thus, the factor will vary depending upon the actual grade of given plastic type. POLYPROPYLENE EXAMPLE: Factor Distance Temp. Chng. Expansion .000048 x 24" = .001152 x 60 DegF = .0690"
Asked in Energy
What converts sunlight into thermal energy without pumps or fans?
Asked in Chemical Engineering
What is the function of chemical engineer in automotive design?
Below is a partial list of the function of chemical engineers in automotive design: 1. Thermal management of fuel systems, mainly fuel tank, to reduce fuel temperature and fuel vapor pressure. This requires applications of thermodynamics of fuel mixtures and heat transfer. 2. Selection of appropriate materials to meet the temperature requirements in the vehicle under-hood and under-body. 3. Approve all selected material for mechanical and thermal requirements 4. Evaluation and selection of low weight composite materials for improvement of fuel economy. 5. Application of predictive methods for evaluation of material life under vehicle thermal environment by applying kinetic thermal degradation models. 6. Simulation of fuel combustion for design of internal combustion or diesel engines. 7. Thermal analysis of exhaust system and evaluation of catalyst warm up time, catalytic conversion efficiency, and exhaust surface temperatures. 8. Estimation of component temperature through application of Computational Fluid Dynamics (CFD) tools.