Lab#1-Bending Moment 1 PDF

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the first experiment in the strength of materials ...

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Laboratory MECH2308CIVE2310

FACULTY OF ENGINEERING,SOHAR UNIVERSITY

Faculty of Engineering Mechanical & Mechatronics Engineering Program

Strength of Materials MECH2308-CIVE2310 Lab Experiment# 1 Bending Moment Test LEVEL – 2 (semester 1) Student's Name Date:.... 25/10/2020

:..Omran Bashar alsid ahmad........... SID...180966....

Laboratory MECH2308CIVE2310

FACULTY OF ENGINEERING,SOHAR UNIVERSITY

BENDING MOMENT TEST INTRODUCTION:- This experiment is about studying the effect of force magnitude on bending of beam. According to the figure in beam structure, beam is supported at two points using pivots. A mechanism is provided which can apply and calculate the force throughout the beam. Free body diagram of the apparatus is shown below. Moments is measured as a force multiplied by a distance so they have as unit N·m. OBJECTIVES:1. To study the action of the bending moment within the beam. 2. To measure experimental bending moment at the cut and to compare it with the theoretical value of a simply supported beam. 3. To plot a graph which compares the experimental and theoretical results? •

load vs theoretical bending moment.

•

load vs experimental bending moment.

EQUIPMENTS USED:A universal frame, bending moment beam assembly, stands, load hangers and set of weights. THEORY:- The purpose of this task was to investigate the influence of various forces on the beam bending moment, and the result shows that there is a linear relationship between the moment of bending and the load applied. The experimental and theoretical bending moment shows a perfect linear correlation with the applied load with very little variation in the bending moment values.

.

Laboratory MECH2308CIVE2310

FACULTY OF ENGINEERING,SOHAR UNIVERSITY

l= length of the simply supported beam = 440 mm a = Distance at which load is acting = 300 mm

PROCEDURE:-

Part 1

Fig.1 1. Check the digital force display meter reads zero with no load 2. Place the load hanger with a 100 g mass at the cut as shown in Fig.1. 3. Record the force from the display meter

Laboratory MECH2308CIVE2310

FACULTY OF ENGINEERING,SOHAR UNIVERSITY

4. Repeat the experiment with masses 200g, 300 g etc. 5. Experimental bending moment at the cut = displayed force x 0.125 (N·m) Mass m

Force from the

Weight/Load

Experimental

Theoretical bending moment (Nm)

(grams)

display meter

Applied (W1)

bending

(Sensor)

W1= mg

Moment (Nm)

(N)

(N)

0

0

0

0

0

100

0.4

0.98

0.05

0.069

200

0.9

1.96

0.1125

0.137

300

1.6

2.94

0.2

0.21

400

2.2

3.92

0.275

0.27

500

2.6

4.9

0.325

0.343

Graph:

0.4 0.343 0.325

0.35 0.275 0.27

0.3 0.25

0.21 0.2

0.2 0.137 0.1125

0.15 0.1

0.069 0.05

0.05 0 0 1 ‫فئة‬

2 ‫فئة‬ Experimental bending Moment (Nm)

3 ‫فئة‬

4 ‫فئة‬ Theoretical bending moment (Nm)

Laboratory MECH2308CIVE2310

•

FACULTY OF ENGINEERING,SOHAR UNIVERSITY

Equipment used

And calculation:

at 100 grams: mass = 100g = 100 ∗ 10−3 =0.1 kg Load = mg = (0.1)(9.81) = 0.981 N Experimental bending Moment (Nm): = displayed force x 0.125 (N·m) =0.4*0.125 =0.05N.m Ra=(0.98*0.22)/0,44 =0.49 Theoretical bending moment (Nm) =Ra*0.3-0.98*(0.3-0.22) = 0.49*0.3-0.98*(0.3-0.22) =0.69Nm

Part-2

Fig.2 1) Repeat the experiment with the beam loaded as shown in Fig.3.

Laboratory MECH2308CIVE2310

FACULTY OF ENGINEERING,SOHAR UNIVERSITY

2) Bending moment at the cut = displayed force x 0.125 3) Compare the theoretical and experimental values 4) Plot a graph which compares the experimental and theoretical results. Figure Force Mass Load Mass Load Experimental Theoretica from the

Applied applied Applied m2

display

m1

meter

(g)

(W1)

(g)

applied

Bending

l Bending

(W2)

Moment (N,m)

Moment

0.375

0.3796

N

(Nm)

(N) Fig.2 •

3

200

1.96

300

Equipment used

And calculation:

at 200 grams: mass = 200g = 200 ∗ 10−3 =0.2 kg Load = mg = (0.2)(9.81) = 1.96 N Experimental bending Moment (Nm): = displayed force x 0.125 (N·m) =0.9*0.125 =0.1125N.m Ra=(1.96*0.22)/0.44 =0.98 Theoretical bending moment (Nm) =Ra*0.3-1.96*(0.3-0.22) = 0.98*0.3-1.96*(0.3-0.22) =0.137

2.94

Laboratory MECH2308CIVE2310

FACULTY OF ENGINEERING,SOHAR UNIVERSITY

Analyses and Discussion: Values of the bowing stresses get from the try are displayed within the table over and they are orchestrated within the individual cell agreeing to the stack that deliver that bending minute. All the information is displayed within the charts and agreeing to that chart the hypothetical bowing minute is appearing straight connection with the stack means the esteem of the hypothetical bowing minute increment with the increase within the esteem of connected load and diminish with the diminish within the esteem of connected stack. The proportion with which there's an increase and diminish within the esteem of hypothetical twisting minute is rise to to the proportion with which there's an increment and diminish within the esteem of connected stack.

Conclusion: From experiment. We can use the theatrical value to determine the beam. We can lern more details about the beam and load base on the graph and we also can analyse the type of beam and how the beam response when the load apply by look at shear force diagram.

NAME: omran bashar alsid ahmad STUDENTS ID: 180966...