Charpy V-notch Testing
The Charpy V-notch impact test is a procedure utilized
to determine the response of a material to sudden stress.
The Charpy test provides a measure of the (impact)
energy required to break a material under impact loading at a predetermined temperature. The Charpy Impact/
V‐notch impact test is used to determine the material
toughness or whether a material is ductile or brittle. The
Charpy Impact test (V Notch test) provides a measure
of the energy required to break a material under impact
loading at a ductile to brittle transition temperature for
the steel in question, and will help to demonstrate that a
given process route consistently produces the same level
of impact toughness.
Charpy Pendulum Impact Test
Scale
10mm
(0.39 in)
10mm
(0.39 in)
Pointer
The standard charpy V‐notch test assesses steel consistency and/or quality against a typical steel specification
requirement then tests are usually performed at the test
temperature indicated in the steel standard, for example,
End of
ASTM A1085 requires that the steel achieves a minimum
Swing
of 25 ft-lbs at 40 ºF. The test starts with a specimen of the
steel, the size of which the is dependent on the material
thickness, having a notch machined across one of the
larger dimensions. The notch determines the direction of
crack propagation and the Charpy impact properties will
depend on the orientation of this notch. The maximum
Anvil
kinetic energy is reached at the lowest point of the swing
and the test piece is placed very precisely at this point,
after impact the test piece will either fracture or be
severely deformed. When the hammer (striker) impacts
the specimen, the specimen will absorb energy. The pendulum will continue to
travel to a maximum height on the other side of the swing where a pointer records
the energy lost (absorbed) in fracturing the test piece.
Starting
Position
Hammer
Independence Tube can now perform Charpy Impact (V‐notch) testing in our
Marseilles, Illinois Division. All tests are performed in accordance with ASTM A370.
Certain grades manufactured by Independence Tube require a charpy impact test as
part of the specifications (ASTM A1085, customer specifications of ROPS Roll Over
Protective Structures). Other grades that do not require as part of the specification
can be charpy impact tested for an additional cost.
For orders requiring Charpy, customers should specify:
• Target impact energy value in joules or ft‐lbs
• Test Temperature to which the specimen must be tested
• Specification of the test requirement
Call your Representative for more information or for questions regarding charpy
V‐notch testing. Visit us on‐line at www.independencetube.com
6226 West 74th Street
Chicago, IL 60638
1-800-376-6000
1-708-563-1950 (FAX)
www.independencetube.com
January 2017
Charpy V-notch Testing
Charpy to Joules Conversion
Prefix or symbol for foot pound is: ft. lb.
Prefix or symbol for joule is: J
One foot pound converted to joule equals = 1.36 J (1 ft. lb. = 1.36 J)
Foot
Pound
(ft-lb)
1
joule (J)
1.35581795
Foot
Pound
(ft-lb)
joule (J)
Foot
Pound
(ft-lb)
34
46.0978103
67
joule (J)
90.83980265
Foot
Pound
(ft-lb)
joule (J)
Foot
Pound
(ft-lb)
joule (J)
100
135.581795
133
180.3237874
2
2.7116359
35
47.45362825
68
92.1956206
101
136.937613
134
181.6796053
3
4.06745385
36
48.8094462
69
93.55143855
102
138.2934309
135
183.0354233
4
5.4232718
37
50.16526415
70
94.9072565
103
139.6492489
136
184.3912412
5
6.77908975
38
51.5210821
71
96.26307445
104
141.0050668
137
185.7470592
6
8.1349077
39
52.87690005
72
97.6188924
105
142.3608848
138
187.1028771
7
9.49072565
40
54.232718
73
98.97471035
106
143.7167027
139
188.4586951
41
55.58853595
74
107
145.0725207
140
189.814513
8
10.8465436
100.3305283
9
12.20236155
42
56.9443539
75
101.6863463
108
146.4283386
141
191.170331
10
13.5581795
43
58.30017185
76
103.0421642
109
147.7841566
142
192.5261489
11
14.91399745
44
59.6559898
77
104.3979822
110
149.1399745
143
193.8819669
12
16.2698154
45
61.01180775
78
105.7538001
111
150.4957925
144
195.2377848
13
17.62563335
46
62.3676257
79
107.1096181
112
151.8516104
145
196.5936028
14
18.9814513
47
63.72344365
80
108.465436
113
153.2074284
146
197.9494207
15
20.33726925
48
65.0792616
81
109.821254
114
154.5632463
147
199.3052387
16
21.6930872
49
66.43507955
82
111.1770719
115
155.9190643
148
200.6610566
17
23.04890515
50
67.7908975
83
112.5328899
116
157.2748822
149
202.0168746
18
24.4047231
51
69.14671545
84
113.8887078
117
158.6307002
150
203.3726925
19
25.76054105
52
70.5025334
85
115.2445258
118
159.9865181
151
204.7285105
20
27.116359
53
71.85835135
86
116.6003437
119
161.3423361
152
206.0843284
21
28.47217695
54
73.2141693
87
117.9561617
120
162.698154
153
207.4401464
22
29.8279949
55
74.56998725
88
119.3119796
121
164.053972
154
208.7959643
23
31.18381285
56
75.9258052
89
120.6677976
122
165.4097899
155
210.1517823
24
32.5396308
57
77.28162315
90
122.0236155
123
166.7656079
156
211.5076002
25
33.89544875
58
78.6374411
91
123.3794335
124
168.1214258
157
212.8634182
26
35.2512667
59
79.99325905
92
124.7352514
125
169.4772438
158
214.2192361
27
36.60708465
60
81.349077
93
126.0910694
126
170.8330617
159
215.5750541
28
37.9629026
61
82.70489495
94
127.4468873
127
172.1888797
160
216.930872
29
39.31872055
62
84.0607129
95
128.8027053
128
173.5446976
161
218.28669
30
40.6745385
63
85.41653085
96
130.1585232
129
174.9005156
162
219.6425079
176.2563335
31
42.03035645
64
86.7723488
97
131.5143412
130
163
220.9983259
32
43.3861744
65
88.12816675
98
132.8701591
131
177.6121515
164
222.3541438
33
44.74199235
66
89.4839847
99
134.2259771
132
178.9679694
165
223.7099618
Call your Representative for more information or for questions regarding charpy
V‐notch testing. Visit us on‐line at www.independencetube.com
6226 West 74th Street
Chicago, IL 60638
1-800-376-6000
1-708-563-1950 (FAX)
www.independencetube.com
January 2017