Integrated Structures Forum

Bonsoir,

Je ne sais pas du tout si je pose ma question au bon forum, alors si ce n'est pas le cas, j'en suis désolée.

Mon conjoint et moi comptons acheter un bien immobilier : une villa neuf sur plan (label BBC). Et j'aurais besoin de vos expériance et de votre concernant les différentes étapes d'achat.

Infos qui vous serons peut être utile pour me répondre : nous nous somme marier depuis quelque semaine. Et nous ne sommes pas non plus à la même caisse de crédit . Il est en CDI depuis 3ans, et moi je suis AE.

Voilà ce que je sais :
1) Prendre un premier rdv avec caisse de crédit . d'avoir une idée de notre budget. -> rdv passé : on a une capacité d'emprunt assez limitée (lui seul peut prétendre à un prêt)

2) Recherche d'appartement -> on a trouvé un résidence neuve label BBC qui nous intéresse énormément (mais qui est au dessus de nos moyens whistle: )

3) Prise de rdv avec l'agence immobilière -> il aura lieu cette semaine Voilà pour le moment où nous en sommes.

Supposons que dans résidence neuve se trouve la maison que nous aimerions effectivement acquerir.
Quelles sont les prochaines étapes?

Démarcher les mon établissement de crédit pour avoir le meilleur prêt à un meilleur taux? Quand devons nous faire la demande pour accéder au PTZ? Avant ou après avoir trouvé une la banque ?
Notre apport personnel provient du PEL de mon conjoint, quels avantages cela nous apporte exactement (le PEL)?

Savez vous si en général les prix indiqués [url=http://terre-a-terres.com/programme-immobilier-neuf-haute-savoie/sciez/… appartement neuf à acheter[/url] sont négociables auprès du promoteur?

J'ai très certainement encore des millions de questions, mais je vais m'arrêter là. Pour le moment cela me semble déjà assez décousu et je n'aimerais pas vous décourager tout de suite lol:

Merci beaucoup d'avoir pris le temps de me lire et à ceux qui pourront me répondre.

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Hello

I modeled a 2-D frame in Ansys and calculate the lateral stiffness, deviding force by max. displacement of frame.

I want to know, how can I directly calculate the lateral stiffness of 2-D frame in Ansys software?

In fact I want to compare this answer with the first one.

Regards

Pooyan

i am doing my research project on stability analysis of a cantilever rotating shaft-disk systems. i need to study  some basic theory about this. please suggest me  some books or publications. my email id is balaji.modepalli [at] gmail.com

I just came across the lecture notes from Professor Nix on Mechanical Properties of Thin Films. It is very educative and helpful. I wonder if anyone could recommend some analytical derivation on the stress of the adhesive layer between two similar/dissimilar adherends (sandwiched specimen) under mechanical or thermal loading.

Many thanks ...

Dear professor suo I am a master graduate of professor sun jun in xi'an jiaotong university, I have done some research on the tension of cu film on Pi substrate. I have a question about the mechanical behavior of thin film:the range of elastic deformation is enlarged just as the plastic stage in your simulation results, since the mutiple neckings result in improved plasticity of Pi-bonded Cu film.could you give me some advice? many thanks

Dear all,

Im a PhD student in Cambridge Uni, UK working in the field of MEMS, and as part of my work, of late Ive been looking at deriving materials properties of MEMS thin film materials by means of resonant testing. The basic outline of the experiment is first creating free standing rectangular cantilevers of the material under test, evaporate with gold to increase reflectivity (when needed), then (under reasonable vacuum) applying a base excitation using a chirp signal into a piezo actuator and logging the cantilever tip response using a laser/photodetector setup. The frequency response is then calculated and the modal frequencies noted.

To determine the materials' properties, both an analytical model (with bending/torsion modes) and finite element model (using 2D mindlin) are created with similar geometry as the sample, and by minimising the squared relative error between the measured modes and those from the models, the value of Young's modulus (known density) and poissons ratio may be determined iteratively. These yield fairly consistent results.

To take the work further I now feel I should also include the effects of residual stress in the cantilevers. The method Ive been looking at is by using finite element (via COMSOL) - the beam geometry is created and loaded with the stress model ('surface stress' as a force tangential to the top boundary, and gradient stress as a 'tangential' force that varies from +F to -F from top to bottom boundary of the cantilever). The model is solved statically, and the deformed shape is then saved as the linearisation point for the next model, which then computes the eigenfrequencies. Btw I can only do this in 3D FE, which makes computation times quite long hence using iteration to quantify this stress highly unlikely.

In any case, is there an analytical model I can use to model the effect of this stress on multiple modes of a cantilever. Id like to verify whether the FE is giving me anything close to ball park numbers before I work out a means to compare them with experimental results. I was thinking of using the Rayleigh method by representing the effect of prestress as an additional term in the potential energy. The original mode shapes, with some modification will be used to evaluate the two energy integrals. The potential energy due to stress is worked out by measuring the static deflected shape using a zygo inteferometer - some rough model is used, with the beam curvature and peak deflection as input to work out the amount of this energy. Not having much experience in mechanics (i was an electronics undergrad!), Im not sure how good an estimate this would be, if at all its a useable or even possible one. Will the extra energy factor in to the torsion modes just the same?