Material Classification
Gbogbo ọrọ náà
Before you can choose a material wisely you have to know the family it belongs to and the way that family behaves. Material classification is the map: it sorts the huge range of materials a designer might use into a handful of groups, each with shared properties and working characteristics, so that naming the class tells you a great deal about what the material will and will not do.
This note classifies the materials on the 0445 syllabus: papers and boards, the three kinds of wood, ferrous and non-ferrous metals and alloys, the two kinds of polymer, and the newer composites and smart materials. For each you will learn the key properties and working characteristics that decide where it is used, and the language examiners expect you to use to describe them.
Ebumnobi
- understand the classification, properties and working characteristics of the following materials: - papers and boards - hardwoods, softwoods and manufactured boards - ferrous and non-ferrous metals and alloys - thermo polymers and thermosetting polymers - composites and smart materials.
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Material Classification. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Which property describes a material's ability to absorb impact without cracking? A. Hardness B. Brittleness C. Toughness D. Density Answer: C
- A ferrous metal is one that: A. Contains no iron B. Contains iron C. Is always non-magnetic D. Is always an alloy Answer: B
- Which statement about thermosetting polymers is correct? A. They soften and can be reshaped every time they are heated B. They undergo a permanent change when set and do not soften on reheating C. They are always transparent D. They can be recycled by melting like thermoplastics Answer: B
- Why is 'hardwood' not a reliable guide to how hard a wood feels? A. All hardwoods are soft B. The term is botanical (broad-leaved trees), so some hardwoods such as balsa are very soft C. Hardwoods are always manufactured boards D. Hardness cannot be measured Answer: B
- Which of these is a smart material that changes colour with temperature? A. Glass-reinforced plastic B. Thermochromic pigment C. Mild steel D. Plywood Answer: B
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Material Classification? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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