PSI - Issue 14

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Nevil Martin Jose et al. / Procedia Structural Integrity 14 (2019) 403–409 Table. 1 Final a/W ratios of the MINI-CT specimens at the end of fatigue precracking Table. 1 Final a/W ratios of the MINI-CT specimens at the end of fatigue precracking Table. 1 Final a/W ratios of the MINI-CT specimens at the end of fatigue precracking Nevil Martin Jose et.al/ Structural Integrity Procedia 00 (2018) 000–000 Table. 1 Final a/ ratios of the INI-CT specimens at the end of fatigue precracking Nevil Martin Jose et.al/ Structural Integrity Procedia 00 (2018) 000–000 Table. 1 Final a/W ratios of the MINI-CT specimens at the end of fatigue precracking Nevil Martin Jose et.al/ Structural Integrity Procedia 00 (2018) 000–000 Nevil Martin Jose et.al/ Structural Integrity Procedia 00 (2018) 000–000 Nevil Martin Jose et.al/ Structural Integrity Procedia 00 (2018) 000–000 Nevil Martin Jose et.al/ Structural Integrity Procedia 00 (2018) 000–000

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Specimen ID MINI-CT-1 MINI-CT-2 MINI-CT-3 MINI-CT-4 MINI-CT-5 MINI-CT-6 MINI-CT-7 Specimen ID INI-CT-1 I I-CT-2 I I-CT-3 I I-CT-4 I I-CT-5 MINI-CT-6 I I-CT-7 Specimen ID I I-CT-1 I I-CT-2 I I-CT-3 MINI-CT-4 I I- T-5 MINI-CT-6 MINI-CT-7 Specimen ID I I-C -1 I I-CT-2 I I-CT-3 I I- -4 I I-C 5 I I- -6 I I-C -7 Specimen ID MINI-CT-1 MINI-CT-2 MINI-CT-3 MINI- -4 I I-CT-5 MINI- -6 MINI-CT-7 Specimen ID 1 2 -3 M NI-C 4 I I- 5 MINI-CT-6 MINI-CT-7

i (specimen serial number) i (specimen serial number) i (specimen serial number) i (specimen serial number) i (specimen serial number) i (specimen serial number)

a/W a/ a/W a/ a/W a/W 0.496 0.471 0.473 0.447 0.525 0.497 0.526 0.496 0.471 0.473 0.447 0.525 0.497 0.526 0.496 0.471 0.473 0.447 0.525 0.497 0.526 . 96 0.471 0.473 .447 .525 .497 .526 0.496 0.471 0.473 0.447 0.525 0.497 0.526 0.496 71 0 73 4 5 0.497 0.526

1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7

Table. 1 Final a/W ratios of the MINI-CT specimens at the end of fatigue precracking

2.2 Fracture testing The fracture testing was carried out at -100 degree Celsius. This temperature was selected for the test because this temperature was nearer to the T 0 temperature obtained for this material from standard specimens by D. McCabe et.al, 2005. The specimen is kept closed in the environmental chamber of the machine after holding it using the pin-clevis arrangement. The chamber is then cooled using liquid nitrogen. Once chamber temperature reached -100 o C, the chamber was kept at that temperature with the specimen inside for 1 hour. The specimen was then loaded in displacement control until fracture, with the temperature kept at -100 o C. During the test, the load vs. load line displacement data of the specimen was recorded. A total of seven specimens were tested. All the tests were carried out at -100 o C. Crack growth was not monitored during the fracture tests. 3. Results and discussions 3.1 Results The load vs. load line displacement data obtained from experiments are used for calculating the reference temperature T 0 . These experimental data are shown in Fig. 4. 2.2 Fracture testing The fracture testing as carried out at -100 degree Celsius. This te perature as selected for the test because this temperature was nearer to the T 0 temperature obtained for this aterial fro standard speci ens by D. McCabe et.al, 2005. The specimen is kept closed in the environ ental chamber of the machine after holding it using the pin-clevis arrange ent. The cha ber is then cooled using liquid nitrogen. Once chamber temperature reached -100 o C, the chamber was kept at that temperature with the specimen inside for 1 hour. The specimen was then loaded in displace ent control until fracture, ith the te perature kept at -100 o C. uring the test, the load vs. load line displace ent data of the speci en as recorded. total of seven speci ens ere tested. ll the tests ere carried out at -100 o C. Crack gro th as not onitored during the fracture tests. 3. esults and discussions 3.1 Results The load vs. load line displacement data obtained from experiments are used for calculating the reference te perature T 0 . These experi ental data are sho n in Fig. 4. 2.2 Fracture testing The fracture testing was carried out at -100 degree Celsius. This temperature was selected for the test because this temperature was nearer to the T 0 temperature obtained for this material from standard specimens by D. McCabe et.al, 2005. The specimen is kept closed in the environmental chamber of the machine after holding it using the pin-clevis arrangement. The chamber is then cooled using liquid nitrogen. Once chamber temperature reached -100 o C, the chamber was kept at that temperature with the specimen inside for 1 hour. The specimen was then loaded in displacement control until fracture, with the temperature kept at -100 o C. During the test, the load vs. load line displacement data of the specimen was recorded. A total of seven specimens were tested. All the tests were carried out at -100 o C. Crack growth was not monitored during the fracture tests. 3. Results and discussions 3.1 Results The load vs. load line displacement data obtained from experiments are used for calculating the reference temperature T 0 . These experimental data are shown in Fig. 4. 2.2 Fracture testing The fracture testing was carried out at -100 degree Celsius. T is te perature as selected for the test because this temperature was nearer to the T 0 temperature obtained for his aterial fro standard speci ens by . McCabe et.al, 2005. The speci en is kept closed in the environ ental chamber of the machine after holding it using the pin-clevis arrangement. The chamber is then cooled using liquid nitrogen. Once chamber temperature reached -100 o C, the ha ber as kept at that temperature ith the speci en inside for 1 hour. The specimen was then loaded in displace ent control until fracture, ith th te perature kept at -100 o C. uring the test, the load vs. load line displace ent data of the speci en as recorded. total of seven speci ens ere tested. All the tests were carried out at -100 o C. Crack growth was not monitored during the fracture tests. 3. Results and discussions 3.1 Results The load vs. load line displace ent data obtained fro experiments are used for calculating the reference te perature T 0 . These experi ental data are sho n in Fig. 4. 2.2 Fracture testing The fracture testing was carried out at -100 degree Celsius. This temperature was selected for the test because this temperature was nearer to the T 0 temperature obtained for this material from standard specimens by D. McCabe et.al, 2005. The specimen is kept closed in the environmental chamber of the machine after holding it using the pin-clevis arrangement. The chamber is then cooled using liquid nitrogen. Once chamber temperature reached -100 o C, the chamber was kept at that temperature with the specimen inside f r 1 hour. The specimen was then loaded in displacement control until fracture, with the temperature kept at -100 o C. During the test, the load vs. load line displacement data of the specimen was recorded. A total of seven specimens were tested. All the tests were carried out at -100 o C. Crack growth was not monitored during the fracture tests. . Results and discussions 3.1 Results The load vs. load line displacement data obtained from experiments are used for calculating the reference temperature T 0 . These experimental data are shown in Fig. 4. 2.2 Fracture sting The fracture testing was carried out at -100 degre Cel ius. This temperature was selected for the test because this temp rature was n arer to the T 0 t mperature btained for this material from standard sp cim ns by D. McCabe et.al, 2005. The specimen is kep closed in the environmental chamber f the machine after holding it using the pin-clevis arra gement. The chamber is then cooled using liquid nitrogen. Once chamber temperature reache -100 o C, the chamber was kept at that temperatu e with the specimen inside for 1 hour. Th specimen wa th n lo ded in displacement control until fracture, with he temperatur kept at -100 o C. During the test, the load vs. load line displacement data of the specimen was recorded. A total of seven specimens were tested. All the tests were carried out at -100 o C. Crack growth was not monitored during the fracture tests. 3. Results and discussions 3.1 R sults The load vs. load line displacement data obtained from experiments are used for calculating the reference temperature T 0 . These experimental data are shown in Fig. 4.

MINI‐CT‐Load vs Load Line Displacement at ‐100 C MINI‐CT‐Load vs Load Line Displace ent at ‐100 C MINI‐CT‐Load vs Load Line Displacement at ‐100 C INI‐CT‐Load vs Load Line Displace ent at ‐100 C MINI‐CT‐Load vs Load Line Displacement at ‐100 C MINI‐CT‐Load vs Load Line Displacement at ‐100 C

4 4 4 4 4 MINI‐CT‐1 MINI‐CT‐2 MINI‐CT‐3 MINI‐CT‐4 MINI‐CT‐5 MINI‐CT‐6 MINI‐CT‐7 MINI‐CT‐1 MINI‐CT‐2 MINI‐CT‐3 MINI‐CT‐4 INI‐CT‐5 MINI‐CT‐6 INI‐CT‐7 MINI‐CT‐1 MINI‐CT‐2 MINI‐CT‐3 MINI‐CT‐4 MINI‐CT‐5 MINI‐CT‐6 MINI‐CT‐7 INI‐CT‐1 MINI‐CT‐2 MINI‐CT‐3 MINI‐CT‐4 INI‐CT‐5 MINI‐CT‐6 MINI‐CT‐7 1 2 MINI‐CT‐3 INI‐CT‐4 5 INI‐CT‐6 MINI‐CT‐7 I I‐ ‐1 I I‐ ‐2 I I‐ ‐3 MINI‐CT‐4 I I‐ ‐5 MINI‐CT‐6 MINI‐CT‐7

0 500 0 500 0 500 0 500 1000 1500 2000 2500 0 500 1000 1500 2000 2500 0 500 100 5 2000 5 1000 1500 2000 2500 1000 1500 2000 2500 1000 1500 2000 2500

Force (N) Force (N) Force (N) Force (N) Force (N) Force (N)

0 0 0 0 0

1 1 1 1 1

2 2 2 2 2

3 3 3 3 3

Load Line Displacement (mm) Load Line Displacement ( ) Load Line Displacement (mm) Load Line Displacement ( )

Fig.4 Experimental data – Load vs load line displacement data of fracture tests The calculations are carried out as per the equations given in ASTM E1921 for single temperature tests. For calculations, the load vs load line displacement data up to maximum load point only is used. First, from the load vs load line displacement data, the applied J integral value is obtained by dividing the area under the data into elastic and plastic regions The elastic region gives J el and the plastic region gives J pl . The total applied J known as J c is given by J c = J el +J pl (2) The J c value obtained above is converted to K Jc using the following equation K �� � �J � �� � � � (3) Fig.4 Experimental data – Load vs load line displacement data of fracture tests The calculations are carried out as per the equations given in ASTM E1921 for single te perature tests. For calculations, the load vs load line displace ent data up to axi u load point only is used. First, fro the load vs load line displace ent data, the applied J integral value is obtained by dividing the area under the data into elastic and plastic regions The elastic region gives J el and the plastic region gives J pl . The total applied J known as J c is given by J c = J el +J pl (2) The J c value obtained above is converted to Jc using the follo ing equation K �� � J � �� � � � (3) Fig.4 Experimental data – Load vs load line displacement data of fracture tests The calculations are carried out as per the equations given in ASTM E1921 for single temperature tests. For calculations, the load vs load line displacement data up to maximum load point only is used. First, from the load vs load line displacement data, the applied J integral value is obtained by dividing the area under the data into elastic and plastic regions The elastic region gives J el and the plastic region gives J pl . The total applied J known as J c is given by J c = J el +J pl (2) The J c value obtained above is converted to K Jc using the following equation K �� � �J � �� � � � (3) Fig.4 Experimental data – Load vs load line displacement data of fracture tests The c lculations are carried out as er the equations given in ASTM E1921 for single temperature tests. For calculations, the load vs load line displacement data up to maximu load point only is used. First, from the load vs load line displacement data, the applied J integral value is obtained by dividing t area under the data into elastic and plastic regions The elastic region gives J el and the plastic region gives J pl . The total applied J known as J c is given by J c = J el +J pl (2) The J c value obtained above is converted to K Jc using the following equation K �� J � �� � � � (3) Fig.4 Experimental data – Load vs load line displacement data of fracture tests The calculations are carried out as per the equations given in ASTM E1921 for single temperature tests. For calculations, the load vs load line displacement data up to maximum load point only is used. First, from the load vs load line displacement data, the applied J integral value is obtained by dividing the area under the data into elastic and plastic regions The elastic region gives J el and the plastic region gives J pl . The total applied J known as J c is given by J c = J el +J pl (2) The J c value obtained above is converted to K Jc using the following equation K �� � �J � �� � � � (3) Load Line Di lacement (mm) Fig.4 Experimental data – Load vs load line displace ent data of fracture tests The calculations are carried out as per the equations given in ASTM E1921 for single temperature tests. For calculations, the load vs load line displacement data up to maximum load point on y is used. First, from the lo d vs load line displacement data, the applied J integral value is obtained by dividing the area under the data into elastic and plastic regions The elastic region gives J el and the plastic region gives J pl . The total applied J known as J c is given by J c = J el +J pl (2) The J c value obtained above is converted to K Jc using the following equation K �� � �J � �� � � � (3) 0 1 2 3 4 Load Line Displacement (mm)