Selection Properties(3)

1

Ir. Yongky Permana, M.Eng

Mechanical Design Lab.Mechanical Engineering DepartmentFakultas Teknik– Universitas Indonesia

DTM FTUI Pemilihan Bahan dan Proses(Material Selection and Proces)

2

Mechanical Design Lab.Mechanical Engineering DepartmentFakultas Teknik– Universitas Indonesia

DTM FTUI

• Performance characteristic of a material usually are express in 1. Physical Properties2. Mechanical Properties3. Thermal Properties4. Electrical Properties5. Chemical Properties

• Material Properties are the link between basic structure and composition of the material and the service performance

MATERIAL CHARACTERISTIC

Structure

Atomic Bonding

Crystal Structure

Defect Structure

Microstructure

Macrostructure

Material Properties

Service Performance

Stresses

Corrosion

Temperature

Radiation

Vibration

Material Science

Material Eng.

3

Mechanical Design Lab.Mechanical Engineering DepartmentFakultas Teknik– Universitas Indonesia

DTM FTUI The Scope in Material Science

Material Science deals with the purpose of how

to improve material properties by controlling structure.

Material Engineering deals with the purpose of how

Optimize the use of material with certain properties to achieve

best service performance in the product’s design scope .

4

Mechanical Design Lab.Mechanical Engineering DepartmentFakultas Teknik– Universitas Indonesia

DTM FTUI STRUCTURE Structure has dimension vary from atomic

dimension to macroscopic crack in a certain defect.

The most common methods of altering structure of a material are by1. Composition Control (Alloying)2. Heat Treatment3. Deformation Processing

5

Mechanical Design Lab.Mechanical Engineering DepartmentFakultas Teknik– Universitas Indonesia

DTM FTUI Dimension of Material Structure

6

Mechanical Design Lab.Mechanical Engineering DepartmentFakultas Teknik– Universitas Indonesia

DTM FTUI Relation between Failure Modes & Mechanical Properties

7

Mechanical Design Lab.Mechanical Engineering DepartmentFakultas Teknik– Universitas Indonesia

DTM FTUI

Material Properties

Performance Specification is the basic functional requirements of the product. (from here the design parameter is developed)

Product Specification is a list of conditions under which the component or material of the design is purchased.

8

Mechanical Design Lab.Mechanical Engineering DepartmentFakultas Teknik– Universitas Indonesia

DTM FTUI

Performance Characteristic

9

Mechanical Design Lab.Mechanical Engineering DepartmentFakultas Teknik– Universitas Indonesia

DTM FTUI

Material Properties Other Properties that may be important to the

design are

Type of Test EnvironmentStress StateSpecimen Configuration

10

Mechanical Design Lab.Mechanical Engineering DepartmentFakultas Teknik– Universitas Indonesia

DTM FTUI

Fatigue Properties

11

Mechanical Design Lab.Mechanical Engineering DepartmentFakultas Teknik– Universitas Indonesia

DTM FTUI

PROBLEM Apakah yang dimaksud dengan properti

diatas tadi? Lakukan proses disain untuk kursi mulai

dari tuntutan konsumen yang kalian spesifikasikan berdasarkan pengalaman kalian sampai kepada sketsa konsep gambar rancangan kursi tersebut, sesuai langkah-langkah dalam proses desain yang ada.