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3.042 Materials Project Laboratory (MIT) 3.042 Materials Project Laboratory (MIT)

Description

As its name implies, the 3.042 Materials Project Laboratory involves working with such operations as investment casting of metals, injection molding of polymers, and sintering of ceramics. After all the abstraction and theory in the lecture part of the DMSE curriculum, many students have found this hands-on experience with materials to be very fun stuff - several have said that 3.042/3.082 was their favorite DMSE subject. The lab is more than operating processing equipment, however. It is intended also to emulate professional practice in materials engineering project management, with aspects of design, analysis, teamwork, literature and patent searching, Web creation and oral presentation, and more. As its name implies, the 3.042 Materials Project Laboratory involves working with such operations as investment casting of metals, injection molding of polymers, and sintering of ceramics. After all the abstraction and theory in the lecture part of the DMSE curriculum, many students have found this hands-on experience with materials to be very fun stuff - several have said that 3.042/3.082 was their favorite DMSE subject. The lab is more than operating processing equipment, however. It is intended also to emulate professional practice in materials engineering project management, with aspects of design, analysis, teamwork, literature and patent searching, Web creation and oral presentation, and more.

Subjects

Student project teams design and fabricate a materials engineering prototype using processing technologies (injection molding | Student project teams design and fabricate a materials engineering prototype using processing technologies (injection molding | thermoforming | thermoforming | investment casting | investment casting | powder processing | powder processing | three-dimensional printing | three-dimensional printing | physical vapor deposition | physical vapor deposition | etc.) appropriate for the materials and device of interest. Goals include using MSE fundamentals in a practical application; understanding trade-offs between design | etc.) appropriate for the materials and device of interest. Goals include using MSE fundamentals in a practical application; understanding trade-offs between design | processing and performance; and fabrication of a deliverable prototype. Emphasis on teamwork | processing and performance; and fabrication of a deliverable prototype. Emphasis on teamwork | project management | project management | communications and computer skills | communications and computer skills | and hands-on work using student and MIT laboratory shops. Teams document their progress and final results by means of web pages and weekly oral presentations. Instruction and practice in oral communication provided. | and hands-on work using student and MIT laboratory shops. Teams document their progress and final results by means of web pages and weekly oral presentations. Instruction and practice in oral communication provided.

License

Content within individual OCW courses is (c) by the individual authors unless otherwise noted. MIT OpenCourseWare materials are licensed by the Massachusetts Institute of Technology under a Creative Commons License (Attribution-NonCommercial-ShareAlike). For further information see http://ocw.mit.edu/terms/index.htm

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Strain induced birefringence in a thermoformed PET cup

Description

The base of the cup is the least strained part of the sheet. Nevertheless, residual strain, increasing with radius, is evident when the specimen is viewed between crossed polars. The polymer chains are more highly aligned where the strain is greatest and this leads to greater birefringence (rotation of polarised light). Hence a circumferential pattern of colours is observed. If heated above the glass-transition temperature of PET (70-80 °C), the cup will tend to retract towards its unstrained form of a sheet. The dark 'Maltese cross', spreading out horizontally and vertically from the centre, indicates the extinction directions or the orientations of the two polarising films, where the intensity of transmitted light is lowest. Note: most clear plastic cups are made from polystyrene (PS)

Subjects

alignment | birefringence | cup | drawing | polyester | polyethylene terephthalate (pet) | polymer | strain | thermoforming | doitpoms | university of cambridge | micrograph | corematerials | ukoer | Engineering | H000

License

Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales http://creativecommons.org/licenses/by-nc-sa/2.0/uk/ http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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3.042 Materials Project Laboratory (MIT)

Description

As its name implies, the 3.042 Materials Project Laboratory involves working with such operations as investment casting of metals, injection molding of polymers, and sintering of ceramics. After all the abstraction and theory in the lecture part of the DMSE curriculum, many students have found this hands-on experience with materials to be very fun stuff - several have said that 3.042/3.082 was their favorite DMSE subject. The lab is more than operating processing equipment, however. It is intended also to emulate professional practice in materials engineering project management, with aspects of design, analysis, teamwork, literature and patent searching, Web creation and oral presentation, and more.

Subjects

Student project teams design and fabricate a materials engineering prototype using processing technologies (injection molding | thermoforming | investment casting | powder processing | three-dimensional printing | physical vapor deposition | etc.) appropriate for the materials and device of interest. Goals include using MSE fundamentals in a practical application; understanding trade-offs between design | processing and performance; and fabrication of a deliverable prototype. Emphasis on teamwork | project management | communications and computer skills | and hands-on work using student and MIT laboratory shops. Teams document their progress and final results by means of web pages and weekly oral presentations. Instruction and practice in oral communication provided.

License

Content within individual OCW courses is (c) by the individual authors unless otherwise noted. MIT OpenCourseWare materials are licensed by the Massachusetts Institute of Technology under a Creative Commons License (Attribution-NonCommercial-ShareAlike). For further information see https://ocw.mit.edu/terms/index.htm

Site sourced from

https://ocw.mit.edu/rss/all/mit-allcourses.xml

Attribution

Click to get HTML | Click to get attribution | Click to get URL

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Strain induced birefringence in a thermoformed PET cup

Description

The base of the cup is the least strained part of the sheet. Nevertheless, residual strain, increasing with radius, is evident when the specimen is viewed between crossed polars. The polymer chains are more highly aligned where the strain is greatest and this leads to greater birefringence (rotation of polarised light). Hence a circumferential pattern of colours is observed. If heated above the glass-transition temperature of PET (70-80 C), the cup will tend to retract towards its unstrained form of a sheet. The dark 'Maltese cross', spreading out horizontally and vertically from the centre, indicates the extinction directions or the orientations of the two polarising films, where the intensity of transmitted light is lowest. Note: most clear plastic cups are made from polystyren

Subjects

alignment | birefringence | cup | drawing | polyester | polyethylene terephthalate (PET) | polymer | strain | thermoforming | DoITPoMS | University of Cambridge | micrograph | corematerials | ukoer

License

http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

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http://core.materials.ac.uk/rss/doitpoms_images.xml

Attribution

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