CFS Joint Design & Load Calculations 2

Question 1

In a bolted joint under eccentric loading, the fastener farthest from the centroid of the bolt group experiences:

Accepted Answer

The largest shear force

Answer

Fasteners farthest from the centroid carry the greatest shear because the eccentric moment creates forces proportional to the distance from the centroid.

Question 2

The 'joint stiffness ratio' (Ck) in a bolted connection is defined as the ratio of:

Accepted Answer

Bolt stiffness to clamped material stiffness

Answer

Ck = Kb / Km, where Kb is bolt stiffness and Km is the stiffness of the clamped members, and it determines how external load is shared.

Question 3

When calculating the tensile stress area of a threaded fastener, which diameter is used?

Accepted Answer

A diameter between pitch and minor diameters

Answer

The tensile stress area uses an effective diameter between the pitch and minor diameters, defined by ASME/ASTM standards as approximately (d_pitch + d_minor)/2.

Question 4

A joint under combined shear and tension loading should be checked against:

Accepted Answer

The von Mises (distortion energy) criterion

Answer

The von Mises criterion accounts for the interaction of shear and tensile stresses to predict yielding under combined loading.

Question 5

Which factor does NOT directly affect the clamp load developed when tightening a fastener to a specified torque?

Accepted Answer

Fastener material tensile strength

Answer

Clamp load from applied torque is governed by friction coefficients and thread geometry (pitch/lead angle), not by the tensile strength of the fastener material.

(CFS) Certified Fastener Specialist Practice Test

(CFS) Certified Fastener Specialist Practice Test

CFS Joint Design & Load Calculations 2