Mechanical Characterization of Solid Oxide Fuel Cells and Sealants



Download 6,18 Mb.
Pdf ko'rish
bet17/56
Sana22.06.2022
Hajmi6,18 Mb.
#693476
1   ...   13   14   15   16   17   18   19   20   ...   56
Dislocation creep mechanisms 
Dislocation glide climb, climb controlled 
4-5 
Lattice 
Dislocation glide climb, glide controlled 

Lattice 
Dislocation of dislocation loops 

Lattice 
Dislocation climb without glide 

Lattice 
Dislocation climb by pipe diffusion 

Dislocation core 
Diffusion creep mechanisms 
Vacancy flow through grains 

Lattice 
Vacancy flow through boundaries 

Grain boundary 
Interface reaction control 

Lattice/ Grain boundary 
Grain boundary sliding mechanisms 
Sliding with liquid 

Liquid 
Sliding without liquid ( diffusion control) 

Lattice/grain boundary 
(2) Bending tests
Cell materials for SOFCs are nowadays normally produced by tape-casting to obtain thin layers. 
This shape of the materials makes it difficult to carry out compressive or tensile creep test. 
Hence, flexure bending tests, such as four-bending test are considered as an effective method to 
study the creep of ceramics [153]. They are easy to perform and avoid problems of alignment 
and fixing for the brittle materials. However, creep deformation can be different in tension and 
compression leading to problems in deriving creep data of ceramics from bending tests. 
Hollenberg 
et al.
[154] derived a relationship between creep strain and loading-point deflection 
for steady-state creep with the assumption that the neutral axis passed through the centre of 
cross-sectional area of the specimen. Snowden and Mehrtens [155] modified the expression 
related to the center deflection of specimen, which made the data analysis and experiment 
measurement more simple and convebending.


Literature review 
37 
Figure 3-24: Schematic of the partly circular bent beam [156]. 
The strain 
𝜀
𝑐
at the center of beam and the relation between the strain 
𝜀
𝑚
in the outer beam and 
the load-point deflection, respectively, can be expressed as [154, 156] :
𝜀
𝑐
=
−ℎ
(
𝑛
𝑛 + 2) (
𝐿 − 𝑎
2 )
2

𝐿
2
4
∙ 𝑦
𝑐
(3-12) 
𝜀
𝑚
=
2ℎ (𝑛 + 2)
(𝐿 − 𝑎)[𝐿 + 𝑎(𝑛 + 1)]
∙ 𝑦
𝐿
(3-13) 
where 
𝑦
𝑐 


Download 6,18 Mb.

Do'stlaringiz bilan baham:
1   ...   13   14   15   16   17   18   19   20   ...   56




Ma'lumotlar bazasi mualliflik huquqi bilan himoyalangan ©hozir.org 2024
ma'muriyatiga murojaat qiling

kiriting | ro'yxatdan o'tish
    Bosh sahifa
юртда тантана
Боғда битган
Бугун юртда
Эшитганлар жилманглар
Эшитмадим деманглар
битган бодомлар
Yangiariq tumani
qitish marakazi
Raqamli texnologiyalar
ilishida muhokamadan
tasdiqqa tavsiya
tavsiya etilgan
iqtisodiyot kafedrasi
steiermarkischen landesregierung
asarlaringizni yuboring
o'zingizning asarlaringizni
Iltimos faqat
faqat o'zingizning
steierm rkischen
landesregierung fachabteilung
rkischen landesregierung
hamshira loyihasi
loyihasi mavsum
faolyatining oqibatlari
asosiy adabiyotlar
fakulteti ahborot
ahborot havfsizligi
havfsizligi kafedrasi
fanidan bo’yicha
fakulteti iqtisodiyot
boshqaruv fakulteti
chiqarishda boshqaruv
ishlab chiqarishda
iqtisodiyot fakultet
multiservis tarmoqlari
fanidan asosiy
Uzbek fanidan
mavzulari potok
asosidagi multiservis
'aliyyil a'ziym
billahil 'aliyyil
illaa billahil
quvvata illaa
falah' deganida
Kompyuter savodxonligi
bo’yicha mustaqil
'alal falah'
Hayya 'alal
'alas soloh
Hayya 'alas
mavsum boyicha


yuklab olish