TAILIEUCHUNG - Engineering Materials vol 1 Part 13

Tham khảo tài liệu 'engineering materials vol 1 part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 292 Engineering Materials 1 the bottom of the tray to form a line of stepping stones spaced equally 3mm apart and going straight across the centre of the tray from edge to edge. Cap the top of each stepping stone with a 6-mm self-adhesive disc. Lightly grease the inside of the tray and also the stepping stones. Place tray on overhead projector. Gently pour coloured water into one side of tray until water is near stepping-stone obstacles. Tilt tray up slightly to allow water to run up to obstacles. Show bowing of water meniscus between obstacles with eventual breakthrough the surface tension of the water is analogous to the line tension of a dislocation and regions where the water has broken through are analogous to regions of the crystal that have undergone plastic deformation by amount b. Chapter 11 Slides Necked tensile specimens of metals deep drawing operations and deep-drawn cans etc. Demonstrations a Push two very blunt wooden wedges together on overhead projector Fig. to show shearing under compressive loading b Make twodimensional working model of Fig. out of PMMA sheet for use on overhead projector note - remove offending apexes to allow movement and put markers on either side of shear planes to show up the shear displacements on the overhead c Necking of plasticine on overhead projector see demonstration in Chapter 8 . d Stable necking of polyethylene. Cut a gauge length 7 X 70 mm from polyethylene sheet length of specimen parallel to roll direction of sheet . Pull in tension on overhead and observe propagation of stable neck. Chapter 12 Slides Springs of various types multi-leaf springs on trucks automobiles steam locomotives etc. light pressure vessels - . aeroplane fuselages cheap pressure vessels - . water tanks nuclear reactor vessels metal rolling stand. Demonstrations Take a strip mm X 1 cm X 15 cm of cold-rolled work-hardened brass and bend it on edge on the overhead until permanent deformation takes place. Anneal brass strip

TỪ KHÓA LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.