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CARA UNTUK MENJAWAB "BENDING STRESS"

untuk menjawab soalan Bending Stress ...

1. mesti kenalpasti bentuk beam dahulu iaitu

a) Symmetrical: iaitu mempunyai bentuk yang sama atau simetri di bahagian atas dan bawah.
sebagai contoh:







b) Unsymmetrical: iaitu bentuk yang tidak sama di bahagian bawah dengan yang di bahagian atas. cuba tengok seperti di bawah ini


selain daripada itu, bentuk L, U juga termasuk di dalam bentuk unsymmetrical


2) sekiranya symmetrical, pastikan samada beam itu jenis simply supported beam atau cantilever beams



i) jika simply supported beams:
 

 
ii) jika cantilever beams:


3) sekiranya unsymmetrical,

step 1: calculate position of y dari tapak bawah


step 2: calculate Ixx



step 3: barulah calculate nilai stress compression dan tension dengan guna formula di bawah.

Mari kita cuba selesaikan satu soalan untuk setiap kes symmetrical dan unsymmetrical.

Kes 01: Symmetrical (types: cantilever beam & calculate diameter of beam)





Kes 02: Symmetrical





Kes 03: Unsymmetrical






c) cantilever compression at bottom = 70.7mm
    cantilever tension is at top = (100+15) - 70.7 = 44.3


d) calculate the value  of stresses (compression and tension)



d) draw the diagram






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