Question

Soru 1 Üç tahta plaka iki farklı biçimde birbirlerine yapıştırılarak Şekil 1(a) ve Şekil 1(b)'deki kiriş kesitleri oluşturulmuştur. a. Yapıştırma bağlantısı bakımından hangi tasarım daha uygundur açıklayınız. b. Tahta plakalar ve yapıştırıcı malzeme için kesme mukavemetleri sırasıyla Ttahta=7 MPa ve Tyapıştırıcı=3 MPa olarak verildiğine göre kesite güvenli bir biçimde uygulanabilecek en büyük kesme kuvvet, V, değerini hesaplayınız. 75 mm 75 mm 25 mm 25 mm 75 mm 25 mm 25 mm Şekil 1(a) 75 mm 25 mm 25 mm Şekil 1(b)

Question 1
Three wooden boards were glued to each other in two different ways, and the beam sections in Figure 1 (a) and Figure 1 (b) were formed.
a. Describe which design is best suited for bonding.
b. Calculate the largest shear force, V, that can be safely applied to the section, since the shear strengths for wood boards and adhesive material are given as τboard = 7 MPa and τ adhesive = 3 MPa, respectively.

Answer 1

a) Design b' is best suited for bonding. This is because the application of shear of Forcev in first design (a) will by to break the adhesive bond between wood block. While in design two blocks are fressed together when u force is applied. So we should go with design b for bonding b the b ) Design a The v force is producing shear in the bond. & maximum possible 3 MPa 3 MPa V area of adhesive v 25xd V = 3 MPa XQ5XL = 750 Force per unit length, v 15 N/mm Design b This bears is similar to beams undergoing bending. shear stress maximung possible YMPa shear force v 7 Area of beam V 2 7 x 25xl Ve 175 l one per unit length 2 175 N/mm