Metal
Failure analysis of porcupine quills under axial compression reveals their mechanical response during buckling
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Porcupine quills are natural structures formed by a thin walled conical shell and an inner foam core. Axial compression tests, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR) were all used to compare the characteristics and mechanical properties of porcupine quills with and without core. The failure mechanisms that occur during buckling were analyzed by scanning electron microscopy (SEM), and it was found that delamination buckling is mostly responsible for the decrease in the measured buckling stress of the quills with regard to predicted theoretical values. Our analysis also confirmed that the foam core works as an energy dissipater improving the mechanical response of an empty cylindrical shell, retarding the onset of buckling as well as producing a step wise decrease in force after buckling, instead of an instantaneous decrease in force typical for specimens without core. Cell collapse and cell densification in the inner foam core were identified as the key mechanisms that allow for energy absorption during buckling.
This article originally appeared in Journal of the Mechanical Behavior of Biomedical Materials 39, 2014, Pages 111-118.
Sign up or log in to your free Materials Today account to download the full article.
Sign up or log in to your free Materials Today account to download the full article.
Porcupine quills are natural structures formed by a thin walled conical shell and an inner foam core. Axial compression tests, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR) were all used to compare the characteristics and mechanical properties of porcupine quills with and without core. The failure mechanisms that occur during buckling were analyzed by scanning electron microscopy (SEM), and it was found that delamination buckling is mostly responsible for the decrease in the measured buckling stress of the quills with regard to predicted theoretical values. Our analysis also confirmed that the foam core works as an energy dissipater improving the mechanical response of an empty cylindrical shell, retarding the onset of buckling as well as producing a step wise decrease in force after buckling, instead of an instantaneous decrease in force typical for specimens without core. Cell collapse and cell densification in the inner foam core were identified as the key mechanisms that allow for energy absorption during buckling.
This article originally appeared in Journal of the Mechanical Behavior of Biomedical Materials 39, 2014, Pages 111-118.
Sign up or log in to your free Materials Today account to download the full article.
Metal
Ex-CIS BPI price hits new high in fresh booking to US
By the end of week, a basic pig iron supplier succeeded in booking material at a new high.
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SteelOrbis Elektronik Pazaryeri A.Ş. (“SteelOrbis”)
19 Mayıs Mahallesi, Atatürk Caddesi
Şeref Yazgan İş Merkezi, No: 72, Kat: 7, D: 18
Kozyatağı – 34736
Istanbul, Turkey
Trade Registration Number : 541892
MERSİS Number : 0470048178400014
Customer Relations Officer : Sinem Alpkaya
Tel : +90 216 468 10 50
Fax : +90 216 386 41 08
This Information Form has been drawn up in order to provide information to the customer (“Customer”) who seeks a free trial on an electronic environment for the purpose of benefiting from the services offered by the SteelOrbis website at “www.steelorbis.com” prior to acceptance of the Membership Contract, and it allows the Customer to gain clear information on the terms and conditions of the membership to be established as well as to review the text of the Contract in question.
The following successive steps shall be taken in order to establish a free trial:
– The Customer selects the “Free Trial” option on the home page at https://www.steelorbis.com.
– The Customer provides all information requested in the “Free Trial Application” form displayed on the screen and confirms it.
– SteelOrbis sends an account activation e-mail to the e-mail address of the Customer provided in the application form.
– The Customer clicks on the activation link sent to his/her e-mail address and activates his/her account. The website Membership Contract is presented to the Customer during the account activation process.
Storage of the Membership Contract:
You can either save the Membership Contract on your computer or make print-outs of it for storage. The Membership Contract accepted and confirmed by the Customer is not kept by SteelOrbis. You can always get access to the standard Membership Contract displayed on the website. However, as amendments may be made to the standard Contract, it may include some variations in comparison with the text approved by you. Accordingly, it may not be possible for you to access on the website the text you originally approved.
Data entry errors:
The information you should provide for membership application and the fields you should fill in are indicated during each step of the operation. You are obliged to provide such information. If you leave the required fields blank, the system will issue a warning. Please fill in all necessary fields. Prior to the completion of the operation, all data entered by you in the previous step will be displayed once more. Please make sure that the information provided by you is accurate and complete before finally confirming the operation; any missing or incorrect information should be completed or corrected. Any amendment or correction on the information provided by you after the confirmation may be performed by means of website logins after the establishment of the membership.
Our confidentiality policy:
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Source: https://www.steelorbis.com/steel-prices/steel-prices-market-analyses/scrap-and-raw-materials/ex_cis-bpi-price-hits-new-high-in-fresh-booking-to-us-1174350.htm
Metal
Chinese manganese ore prices mostly stable, with some slight downticks
Chinese domestic manganese ore prices have followed a mostly stable trend during the past week.
Information Provided By:
SteelOrbis Elektronik Pazaryeri A.Ş. (“SteelOrbis”)
19 Mayıs Mahallesi, Atatürk Caddesi
Şeref Yazgan İş Merkezi, No: 72, Kat: 7, D: 18
Kozyatağı – 34736
Istanbul, Turkey
Trade Registration Number : 541892
MERSİS Number : 0470048178400014
Customer Relations Officer : Sinem Alpkaya
Tel : +90 216 468 10 50
Fax : +90 216 386 41 08
This Information Form has been drawn up in order to provide information to the customer (“Customer”) who seeks a free trial on an electronic environment for the purpose of benefiting from the services offered by the SteelOrbis website at “www.steelorbis.com” prior to acceptance of the Membership Contract, and it allows the Customer to gain clear information on the terms and conditions of the membership to be established as well as to review the text of the Contract in question.
The following successive steps shall be taken in order to establish a free trial:
– The Customer selects the “Free Trial” option on the home page at https://www.steelorbis.com.
– The Customer provides all information requested in the “Free Trial Application” form displayed on the screen and confirms it.
– SteelOrbis sends an account activation e-mail to the e-mail address of the Customer provided in the application form.
– The Customer clicks on the activation link sent to his/her e-mail address and activates his/her account. The website Membership Contract is presented to the Customer during the account activation process.
Storage of the Membership Contract:
You can either save the Membership Contract on your computer or make print-outs of it for storage. The Membership Contract accepted and confirmed by the Customer is not kept by SteelOrbis. You can always get access to the standard Membership Contract displayed on the website. However, as amendments may be made to the standard Contract, it may include some variations in comparison with the text approved by you. Accordingly, it may not be possible for you to access on the website the text you originally approved.
Data entry errors:
The information you should provide for membership application and the fields you should fill in are indicated during each step of the operation. You are obliged to provide such information. If you leave the required fields blank, the system will issue a warning. Please fill in all necessary fields. Prior to the completion of the operation, all data entered by you in the previous step will be displayed once more. Please make sure that the information provided by you is accurate and complete before finally confirming the operation; any missing or incorrect information should be completed or corrected. Any amendment or correction on the information provided by you after the confirmation may be performed by means of website logins after the establishment of the membership.
Our confidentiality policy:
Please click here to review our confidentiality policy.
Source: https://www.steelorbis.com/steel-prices/steel-prices-market-analyses/scrap-and-raw-materials/chinese-manganese-ore-prices-mostly-stable-with-some-slight-downticks-1174347.htm
Metal
Tokyo Steel hikes scrap prices for two assets, ex-Japan prices still rallying
Tokyo Steel has announced a further increase in its local scrap purchase prices by JPY 500-1,000/mt ($4.8-9.6/mt) for two of its assets.
Information Provided By:
SteelOrbis Elektronik Pazaryeri A.Ş. (“SteelOrbis”)
19 Mayıs Mahallesi, Atatürk Caddesi
Şeref Yazgan İş Merkezi, No: 72, Kat: 7, D: 18
Kozyatağı – 34736
Istanbul, Turkey
Trade Registration Number : 541892
MERSİS Number : 0470048178400014
Customer Relations Officer : Sinem Alpkaya
Tel : +90 216 468 10 50
Fax : +90 216 386 41 08
This Information Form has been drawn up in order to provide information to the customer (“Customer”) who seeks a free trial on an electronic environment for the purpose of benefiting from the services offered by the SteelOrbis website at “www.steelorbis.com” prior to acceptance of the Membership Contract, and it allows the Customer to gain clear information on the terms and conditions of the membership to be established as well as to review the text of the Contract in question.
The following successive steps shall be taken in order to establish a free trial:
– The Customer selects the “Free Trial” option on the home page at https://www.steelorbis.com.
– The Customer provides all information requested in the “Free Trial Application” form displayed on the screen and confirms it.
– SteelOrbis sends an account activation e-mail to the e-mail address of the Customer provided in the application form.
– The Customer clicks on the activation link sent to his/her e-mail address and activates his/her account. The website Membership Contract is presented to the Customer during the account activation process.
Storage of the Membership Contract:
You can either save the Membership Contract on your computer or make print-outs of it for storage. The Membership Contract accepted and confirmed by the Customer is not kept by SteelOrbis. You can always get access to the standard Membership Contract displayed on the website. However, as amendments may be made to the standard Contract, it may include some variations in comparison with the text approved by you. Accordingly, it may not be possible for you to access on the website the text you originally approved.
Data entry errors:
The information you should provide for membership application and the fields you should fill in are indicated during each step of the operation. You are obliged to provide such information. If you leave the required fields blank, the system will issue a warning. Please fill in all necessary fields. Prior to the completion of the operation, all data entered by you in the previous step will be displayed once more. Please make sure that the information provided by you is accurate and complete before finally confirming the operation; any missing or incorrect information should be completed or corrected. Any amendment or correction on the information provided by you after the confirmation may be performed by means of website logins after the establishment of the membership.
Our confidentiality policy:
Please click here to review our confidentiality policy.
Source: https://www.steelorbis.com/steel-prices/steel-prices-market-analyses/scrap-and-raw-materials/tokyo-steel-hikes-scrap-prices-for-two-assets-ex_japan-prices-still-rallying-1174340.htm
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