The advantages and disadvantages of aluminium alloys that can replace structural steels in ships needs to be explained. Concept Introduction: Aluminum ranks the third most abundantat available component on the planet but, until the year 1800, it was costly. Aluminum can be molded effortlessly and it has high thermal and electricalconductivitie properties and at low temperatures it does not show a ductile to brittle changeover. Approximately 25% of aluminum formed currently is applicable in the transportation business, another 25% in the production of beverages cans and packaging, 15% in building, 15% in electrical applications and 20 % in other applications.

Question

1. The figure shows a car jack to support 400kg (W=400kg). In the drawing, the angle (0) varies between 15 and 70 °. The links are machined from AISI 1020 hot-rolled steel bars with a minimum yield strength of 380MPa. Each link consists of two bars, one on each side of the central bearings. The bars are 300mm in length (/) and 25 mm in width (w). The pinned ends have the buckling constant (C) of 1.4 for out of plane buckling. The design factor (nd) is 2.5. (1) Find the thickness (t) of the bars and the factor of safety (n). (2) Check if the bar is an Euler beam. D

Answer 1

Question

Chapter 14, Problem 14.4P

Interpretation Introduction

Interpretation:

The advantages and disadvantages of aluminium alloys that can replace structural steels in ships needs to be explained.

Concept Introduction:

Aluminum ranks the third most abundantat available component on the planet but, until the year 1800, it was costly. Aluminum can be molded effortlessly and it has high thermal and electricalconductivitie properties and at low temperatures it does not show a ductile to brittle changeover. Approximately 25% of aluminum formed currently is applicable in the transportation business, another 25% in the production of beverages cans and packaging, 15% in building, 15% in electrical applications and 20 % in other applications.

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1. The figure shows a car jack to support 400kg (W=400kg). In the drawing, the angle (0) varies between 15 and 70 °. The links are machined from AISI 1020 hot-rolled steel bars with a minimum yield strength of 380MPa. Each link consists of two bars, one on each side of the central bearings. The bars are 300mm in length (/) and 25 mm in width (w). The pinned ends have the buckling constant (C) of 1.4 for out of plane buckling. The design factor (nd) is 2.5. (1) Find the thickness (t) of the bars and the factor of safety (n). (2) Check if the bar is an Euler beam. D

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