# Knuckle Joint: compressive strength equal to tensile strength

I was studying the design of joints and came to knuckle joints. Generally compressive strength is greater than tensile strength, but considering knuckle joints compressive strength and tensile strength are considered equal (as mentioned below). What are the reasons for assuming equal strengths?

Here is a link to the page, shown above, in Google Books.

• generally compressive stress is about 2 times the tensile strength. (observed from sums in that book) – Fennekin Jan 9 '16 at 15:12
• Is your confusion about knuckle joints or about the ratio of compression to tension? – hazzey Jan 9 '16 at 23:23
• My doubt is why this is the situation particularly in knuckle joint? – Fennekin Jan 10 '16 at 4:01